972 lines
49 KiB
Ruby
Executable file
972 lines
49 KiB
Ruby
Executable file
module ActiveRecord
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# Raised by save! and create! when the record is invalid. Use the
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# +record+ method to retrieve the record which did not validate.
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# begin
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# complex_operation_that_calls_save!_internally
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# rescue ActiveRecord::RecordInvalid => invalid
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# puts invalid.record.errors
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# end
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class RecordInvalid < ActiveRecordError
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attr_reader :record
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def initialize(record)
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@record = record
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super("Validation failed: #{@record.errors.full_messages.join(", ")}")
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end
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end
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# Active Record validation is reported to and from this object, which is used by Base#save to
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# determine whether the object is in a valid state to be saved. See usage example in Validations.
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class Errors
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include Enumerable
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def initialize(base) # :nodoc:
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@base, @errors = base, {}
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end
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@@default_error_messages = {
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:inclusion => "is not included in the list",
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:exclusion => "is reserved",
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:invalid => "is invalid",
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:confirmation => "doesn't match confirmation",
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:accepted => "must be accepted",
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:empty => "can't be empty",
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:blank => "can't be blank",
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:too_long => "is too long (maximum is %d characters)",
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:too_short => "is too short (minimum is %d characters)",
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:wrong_length => "is the wrong length (should be %d characters)",
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:taken => "has already been taken",
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:not_a_number => "is not a number",
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:greater_than => "must be greater than %d",
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:greater_than_or_equal_to => "must be greater than or equal to %d",
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:equal_to => "must be equal to %d",
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:less_than => "must be less than %d",
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:less_than_or_equal_to => "must be less than or equal to %d",
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:odd => "must be odd",
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:even => "must be even"
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}
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# Holds a hash with all the default error messages that can be replaced by your own copy or localizations.
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cattr_accessor :default_error_messages
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# Adds an error to the base object instead of any particular attribute. This is used
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# to report errors that don't tie to any specific attribute, but rather to the object
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# as a whole. These error messages don't get prepended with any field name when iterating
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# with each_full, so they should be complete sentences.
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def add_to_base(msg)
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add(:base, msg)
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end
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# Adds an error message (+msg+) to the +attribute+, which will be returned on a call to <tt>on(attribute)</tt>
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# for the same attribute and ensure that this error object returns false when asked if <tt>empty?</tt>. More than one
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# error can be added to the same +attribute+ in which case an array will be returned on a call to <tt>on(attribute)</tt>.
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# If no +msg+ is supplied, "invalid" is assumed.
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def add(attribute, msg = @@default_error_messages[:invalid])
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@errors[attribute.to_s] = [] if @errors[attribute.to_s].nil?
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@errors[attribute.to_s] << msg
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end
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# Will add an error message to each of the attributes in +attributes+ that is empty.
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def add_on_empty(attributes, msg = @@default_error_messages[:empty])
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for attr in [attributes].flatten
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value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s]
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is_empty = value.respond_to?("empty?") ? value.empty? : false
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add(attr, msg) unless !value.nil? && !is_empty
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end
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end
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# Will add an error message to each of the attributes in +attributes+ that is blank (using Object#blank?).
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def add_on_blank(attributes, msg = @@default_error_messages[:blank])
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for attr in [attributes].flatten
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value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s]
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add(attr, msg) if value.blank?
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end
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end
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# Returns true if the specified +attribute+ has errors associated with it.
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#
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# class Company < ActiveRecord::Base
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.invalid?(:name) # => true
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# company.errors.invalid?(:address) # => false
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def invalid?(attribute)
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!@errors[attribute.to_s].nil?
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end
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# Returns nil, if no errors are associated with the specified +attribute+.
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# Returns the error message, if one error is associated with the specified +attribute+.
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# Returns an array of error messages, if more than one error is associated with the specified +attribute+.
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#
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# class Company < ActiveRecord::Base
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.on(:name) # => ["is too short (minimum is 5 characters)", "can't be blank"]
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# company.errors.on(:email) # => "can't be blank"
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# company.errors.on(:address) # => nil
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def on(attribute)
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errors = @errors[attribute.to_s]
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return nil if errors.nil?
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errors.size == 1 ? errors.first : errors
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end
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alias :[] :on
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# Returns errors assigned to the base object through add_to_base according to the normal rules of on(attribute).
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def on_base
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on(:base)
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end
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# Yields each attribute and associated message per error added.
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#
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# class Company < ActiveRecord::Base
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.each{|attr,msg| puts "#{attr} - #{msg}" } # =>
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# name - is too short (minimum is 5 characters)
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# name - can't be blank
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# address - can't be blank
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def each
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@errors.each_key { |attr| @errors[attr].each { |msg| yield attr, msg } }
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end
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# Yields each full error message added. So Person.errors.add("first_name", "can't be empty") will be returned
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# through iteration as "First name can't be empty".
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#
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# class Company < ActiveRecord::Base
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.each_full{|msg| puts msg } # =>
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# Name is too short (minimum is 5 characters)
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# Name can't be blank
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# Address can't be blank
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def each_full
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full_messages.each { |msg| yield msg }
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end
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# Returns all the full error messages in an array.
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#
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# class Company < ActiveRecord::Base
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.full_messages # =>
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# ["Name is too short (minimum is 5 characters)", "Name can't be blank", "Address can't be blank"]
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def full_messages
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full_messages = []
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@errors.each_key do |attr|
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@errors[attr].each do |msg|
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next if msg.nil?
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if attr == "base"
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full_messages << msg
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else
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full_messages << @base.class.human_attribute_name(attr) + " " + msg
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end
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end
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end
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full_messages
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end
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# Returns true if no errors have been added.
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def empty?
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@errors.empty?
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end
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# Removes all errors that have been added.
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def clear
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@errors = {}
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end
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# Returns the total number of errors added. Two errors added to the same attribute will be counted as such.
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def size
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@errors.values.inject(0) { |error_count, attribute| error_count + attribute.size }
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end
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alias_method :count, :size
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alias_method :length, :size
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# Returns an XML representation of this error object.
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#
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# class Company < ActiveRecord::Base
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# validates_presence_of :name, :address, :email
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# validates_length_of :name, :in => 5..30
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# end
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#
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# company = Company.create(:address => '123 First St.')
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# company.errors.to_xml # =>
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# <?xml version="1.0" encoding="UTF-8"?>
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# <errors>
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# <error>Name is too short (minimum is 5 characters)</error>
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# <error>Name can't be blank</error>
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# <error>Address can't be blank</error>
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# </errors>
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def to_xml(options={})
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options[:root] ||= "errors"
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options[:indent] ||= 2
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options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
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options[:builder].instruct! unless options.delete(:skip_instruct)
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options[:builder].errors do |e|
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full_messages.each { |msg| e.error(msg) }
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end
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end
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end
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# Active Records implement validation by overwriting Base#validate (or the variations, +validate_on_create+ and
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# +validate_on_update+). Each of these methods can inspect the state of the object, which usually means ensuring
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# that a number of attributes have a certain value (such as not empty, within a given range, matching a certain regular expression).
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#
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# Example:
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#
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# class Person < ActiveRecord::Base
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# protected
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# def validate
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# errors.add_on_empty %w( first_name last_name )
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# errors.add("phone_number", "has invalid format") unless phone_number =~ /[0-9]*/
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# end
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#
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# def validate_on_create # is only run the first time a new object is saved
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# unless valid_discount?(membership_discount)
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# errors.add("membership_discount", "has expired")
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# end
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# end
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#
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# def validate_on_update
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# errors.add_to_base("No changes have occurred") if unchanged_attributes?
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# end
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# end
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#
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# person = Person.new("first_name" => "David", "phone_number" => "what?")
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# person.save # => false (and doesn't do the save)
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# person.errors.empty? # => false
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# person.errors.count # => 2
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# person.errors.on "last_name" # => "can't be empty"
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# person.errors.on "phone_number" # => "has invalid format"
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# person.errors.each_full { |msg| puts msg }
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# # => "Last name can't be empty\n" +
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# "Phone number has invalid format"
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#
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# person.attributes = { "last_name" => "Heinemeier", "phone_number" => "555-555" }
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# person.save # => true (and person is now saved in the database)
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#
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# An Errors object is automatically created for every Active Record.
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#
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# Please do have a look at ActiveRecord::Validations::ClassMethods for a higher level of validations.
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module Validations
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VALIDATIONS = %w( validate validate_on_create validate_on_update )
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def self.included(base) # :nodoc:
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base.extend ClassMethods
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base.class_eval do
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alias_method_chain :save, :validation
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alias_method_chain :save!, :validation
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alias_method_chain :update_attribute, :validation_skipping
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end
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base.send :include, ActiveSupport::Callbacks
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base.define_callbacks *VALIDATIONS
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end
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# All of the following validations are defined in the class scope of the model that you're interested in validating.
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# They offer a more declarative way of specifying when the model is valid and when it is not. It is recommended to use
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# these over the low-level calls to +validate+ and +validate_on_create+ when possible.
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module ClassMethods
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DEFAULT_VALIDATION_OPTIONS = {
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:on => :save,
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:allow_nil => false,
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:allow_blank => false,
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:message => nil
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}.freeze
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ALL_RANGE_OPTIONS = [ :is, :within, :in, :minimum, :maximum ].freeze
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ALL_NUMERICALITY_CHECKS = { :greater_than => '>', :greater_than_or_equal_to => '>=',
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:equal_to => '==', :less_than => '<', :less_than_or_equal_to => '<=',
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:odd => 'odd?', :even => 'even?' }.freeze
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# Adds a validation method or block to the class. This is useful when
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# overriding the +validate+ instance method becomes too unwieldly and
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# you're looking for more descriptive declaration of your validations.
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#
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# This can be done with a symbol pointing to a method:
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#
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# class Comment < ActiveRecord::Base
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# validate :must_be_friends
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#
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# def must_be_friends
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# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# Or with a block which is passed the current record to be validated:
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#
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# class Comment < ActiveRecord::Base
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# validate do |comment|
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# comment.must_be_friends
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# end
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#
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# def must_be_friends
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# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# This usage applies to +validate_on_create+ and +validate_on_update+ as well.
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# Validates each attribute against a block.
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#
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# class Person < ActiveRecord::Base
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# validates_each :first_name, :last_name do |record, attr, value|
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# record.errors.add attr, 'starts with z.' if value[0] == ?z
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# end
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# end
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#
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# Options:
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# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
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# * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+.
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# * <tt>:allow_blank</tt> - Skip validation if attribute is blank.
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
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# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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def validates_each(*attrs)
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options = attrs.extract_options!.symbolize_keys
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attrs = attrs.flatten
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# Declare the validation.
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send(validation_method(options[:on] || :save), options) do |record|
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attrs.each do |attr|
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value = record.send(attr)
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next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
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yield record, attr, value
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end
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end
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end
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# Encapsulates the pattern of wanting to validate a password or email address field with a confirmation. Example:
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#
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# Model:
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# class Person < ActiveRecord::Base
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# validates_confirmation_of :user_name, :password
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# validates_confirmation_of :email_address, :message => "should match confirmation"
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# end
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#
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# View:
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# <%= password_field "person", "password" %>
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# <%= password_field "person", "password_confirmation" %>
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#
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# The added +password_confirmation+ attribute is virtual; it exists only as an in-memory attribute for validating the password.
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# To achieve this, the validation adds accessors to the model for the confirmation attribute. NOTE: This check is performed
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# only if +password_confirmation+ is not +nil+, and by default only on save. To require confirmation, make sure to add a presence
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# check for the confirmation attribute:
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#
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# validates_presence_of :password_confirmation, :if => :password_changed?
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#
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# Configuration options:
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# * <tt>:message</tt> - A custom error message (default is: "doesn't match confirmation").
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# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
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# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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def validates_confirmation_of(*attr_names)
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configuration = { :message => ActiveRecord::Errors.default_error_messages[:confirmation], :on => :save }
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configuration.update(attr_names.extract_options!)
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attr_accessor(*(attr_names.map { |n| "#{n}_confirmation" }))
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validates_each(attr_names, configuration) do |record, attr_name, value|
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record.errors.add(attr_name, configuration[:message]) unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation")
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end
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end
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# Encapsulates the pattern of wanting to validate the acceptance of a terms of service check box (or similar agreement). Example:
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#
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# class Person < ActiveRecord::Base
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# validates_acceptance_of :terms_of_service
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# validates_acceptance_of :eula, :message => "must be abided"
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# end
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#
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# If the database column does not exist, the +terms_of_service+ attribute is entirely virtual. This check is
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# performed only if +terms_of_service+ is not +nil+ and by default on save.
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#
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# Configuration options:
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# * <tt>:message</tt> - A custom error message (default is: "must be accepted").
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# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
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# * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is true).
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# * <tt>:accept</tt> - Specifies value that is considered accepted. The default value is a string "1", which
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# makes it easy to relate to an HTML checkbox. This should be set to +true+ if you are validating a database
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# column, since the attribute is typecast from "1" to +true+ before validation.
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
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# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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def validates_acceptance_of(*attr_names)
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configuration = { :message => ActiveRecord::Errors.default_error_messages[:accepted], :on => :save, :allow_nil => true, :accept => "1" }
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configuration.update(attr_names.extract_options!)
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db_cols = begin
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column_names
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rescue ActiveRecord::StatementInvalid
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[]
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end
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names = attr_names.reject { |name| db_cols.include?(name.to_s) }
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attr_accessor(*names)
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validates_each(attr_names,configuration) do |record, attr_name, value|
|
|
record.errors.add(attr_name, configuration[:message]) unless value == configuration[:accept]
|
|
end
|
|
end
|
|
|
|
# Validates that the specified attributes are not blank (as defined by Object#blank?). Happens by default on save. Example:
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_presence_of :first_name
|
|
# end
|
|
#
|
|
# The first_name attribute must be in the object and it cannot be blank.
|
|
#
|
|
# If you want to validate the presence of a boolean field (where the real values are true and false),
|
|
# you will want to use validates_inclusion_of :field_name, :in => [true, false]
|
|
# This is due to the way Object#blank? handles boolean values. false.blank? # => true
|
|
#
|
|
# Configuration options:
|
|
# * <tt>message</tt> - A custom error message (default is: "can't be blank").
|
|
# * <tt>on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
|
|
# * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
#
|
|
def validates_presence_of(*attr_names)
|
|
configuration = { :message => ActiveRecord::Errors.default_error_messages[:blank], :on => :save }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
# can't use validates_each here, because it cannot cope with nonexistent attributes,
|
|
# while errors.add_on_empty can
|
|
send(validation_method(configuration[:on]), configuration) do |record|
|
|
record.errors.add_on_blank(attr_names, configuration[:message])
|
|
end
|
|
end
|
|
|
|
# Validates that the specified attribute matches the length restrictions supplied. Only one option can be used at a time:
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_length_of :first_name, :maximum=>30
|
|
# validates_length_of :last_name, :maximum=>30, :message=>"less than %d if you don't mind"
|
|
# validates_length_of :fax, :in => 7..32, :allow_nil => true
|
|
# validates_length_of :phone, :in => 7..32, :allow_blank => true
|
|
# validates_length_of :user_name, :within => 6..20, :too_long => "pick a shorter name", :too_short => "pick a longer name"
|
|
# validates_length_of :fav_bra_size, :minimum => 1, :too_short => "please enter at least %d character"
|
|
# validates_length_of :smurf_leader, :is => 4, :message => "papa is spelled with %d characters... don't play me."
|
|
# validates_length_of :essay, :minimum => 100, :too_short => "Your essay must be at least %d words."), :tokenizer => lambda {|str| str.scan(/\w+/) }
|
|
# end
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:minimum</tt> - The minimum size of the attribute.
|
|
# * <tt>:maximum</tt> - The maximum size of the attribute.
|
|
# * <tt>:is</tt> - The exact size of the attribute.
|
|
# * <tt>:within</tt> - A range specifying the minimum and maximum size of the attribute.
|
|
# * <tt>:in</tt> - A synonym(or alias) for <tt>:within</tt>.
|
|
# * <tt>:allow_nil</tt> - Attribute may be +nil+; skip validation.
|
|
# * <tt>:allow_blank</tt> - Attribute may be blank; skip validation.
|
|
# * <tt>:too_long</tt> - The error message if the attribute goes over the maximum (default is: "is too long (maximum is %d characters)").
|
|
# * <tt>:too_short</tt> - The error message if the attribute goes under the minimum (default is: "is too short (min is %d characters)").
|
|
# * <tt>:wrong_length</tt> - The error message if using the <tt>:is</tt> method and the attribute is the wrong size (default is: "is the wrong length (should be %d characters)").
|
|
# * <tt>:message</tt> - The error message to use for a <tt>:minimum</tt>, <tt>:maximum</tt>, or <tt>:is</tt> violation. An alias of the appropriate <tt>too_long</tt>/<tt>too_short</tt>/<tt>wrong_length</tt> message.
|
|
# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:tokenizer</tt> - Specifies how to split up the attribute string. (e.g. <tt>:tokenizer => lambda {|str| str.scan(/\w+/)}</tt> to
|
|
# count words as in above example.)
|
|
# Defaults to <tt>lambda{ |value| value.split(//) }</tt> which counts individual characters.
|
|
def validates_length_of(*attrs)
|
|
# Merge given options with defaults.
|
|
options = {
|
|
:too_long => ActiveRecord::Errors.default_error_messages[:too_long],
|
|
:too_short => ActiveRecord::Errors.default_error_messages[:too_short],
|
|
:wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length],
|
|
:tokenizer => lambda {|value| value.split(//)}
|
|
}.merge(DEFAULT_VALIDATION_OPTIONS)
|
|
options.update(attrs.extract_options!.symbolize_keys)
|
|
|
|
# Ensure that one and only one range option is specified.
|
|
range_options = ALL_RANGE_OPTIONS & options.keys
|
|
case range_options.size
|
|
when 0
|
|
raise ArgumentError, 'Range unspecified. Specify the :within, :maximum, :minimum, or :is option.'
|
|
when 1
|
|
# Valid number of options; do nothing.
|
|
else
|
|
raise ArgumentError, 'Too many range options specified. Choose only one.'
|
|
end
|
|
|
|
# Get range option and value.
|
|
option = range_options.first
|
|
option_value = options[range_options.first]
|
|
|
|
case option
|
|
when :within, :in
|
|
raise ArgumentError, ":#{option} must be a Range" unless option_value.is_a?(Range)
|
|
|
|
too_short = options[:too_short] % option_value.begin
|
|
too_long = options[:too_long] % option_value.end
|
|
|
|
validates_each(attrs, options) do |record, attr, value|
|
|
value = options[:tokenizer].call(value) if value.kind_of?(String)
|
|
if value.nil? or value.size < option_value.begin
|
|
record.errors.add(attr, too_short)
|
|
elsif value.size > option_value.end
|
|
record.errors.add(attr, too_long)
|
|
end
|
|
end
|
|
when :is, :minimum, :maximum
|
|
raise ArgumentError, ":#{option} must be a nonnegative Integer" unless option_value.is_a?(Integer) and option_value >= 0
|
|
|
|
# Declare different validations per option.
|
|
validity_checks = { :is => "==", :minimum => ">=", :maximum => "<=" }
|
|
message_options = { :is => :wrong_length, :minimum => :too_short, :maximum => :too_long }
|
|
|
|
message = (options[:message] || options[message_options[option]]) % option_value
|
|
|
|
validates_each(attrs, options) do |record, attr, value|
|
|
value = options[:tokenizer].call(value) if value.kind_of?(String)
|
|
record.errors.add(attr, message) unless !value.nil? and value.size.method(validity_checks[option])[option_value]
|
|
end
|
|
end
|
|
end
|
|
|
|
alias_method :validates_size_of, :validates_length_of
|
|
|
|
|
|
# Validates whether the value of the specified attributes are unique across the system. Useful for making sure that only one user
|
|
# can be named "davidhh".
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_uniqueness_of :user_name, :scope => :account_id
|
|
# end
|
|
#
|
|
# It can also validate whether the value of the specified attributes are unique based on multiple scope parameters. For example,
|
|
# making sure that a teacher can only be on the schedule once per semester for a particular class.
|
|
#
|
|
# class TeacherSchedule < ActiveRecord::Base
|
|
# validates_uniqueness_of :teacher_id, :scope => [:semester_id, :class_id]
|
|
# end
|
|
#
|
|
# When the record is created, a check is performed to make sure that no record exists in the database with the given value for the specified
|
|
# attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself.
|
|
#
|
|
# Because this check is performed outside the database there is still a chance that duplicate values
|
|
# will be inserted in two parallel transactions. To guarantee against this you should create a
|
|
# unique index on the field. See +add_index+ for more information.
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:message</tt> - Specifies a custom error message (default is: "has already been taken").
|
|
# * <tt>:scope</tt> - One or more columns by which to limit the scope of the uniqueness constraint.
|
|
# * <tt>:case_sensitive</tt> - Looks for an exact match. Ignored by non-text columns (+false+ by default).
|
|
# * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
|
|
# * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
def validates_uniqueness_of(*attr_names)
|
|
configuration = { :message => ActiveRecord::Errors.default_error_messages[:taken], :case_sensitive => true }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
validates_each(attr_names,configuration) do |record, attr_name, value|
|
|
# The check for an existing value should be run from a class that
|
|
# isn't abstract. This means working down from the current class
|
|
# (self), to the first non-abstract class. Since classes don't know
|
|
# their subclasses, we have to build the hierarchy between self and
|
|
# the record's class.
|
|
class_hierarchy = [record.class]
|
|
while class_hierarchy.first != self
|
|
class_hierarchy.insert(0, class_hierarchy.first.superclass)
|
|
end
|
|
|
|
# Now we can work our way down the tree to the first non-abstract
|
|
# class (which has a database table to query from).
|
|
finder_class = class_hierarchy.detect { |klass| !klass.abstract_class? }
|
|
|
|
is_text_column = finder_class.columns_hash[attr_name.to_s].text?
|
|
|
|
if !value.nil? && is_text_column
|
|
value = value.to_s
|
|
end
|
|
|
|
if value.nil? || (configuration[:case_sensitive] || !is_text_column)
|
|
condition_sql = "#{record.class.quoted_table_name}.#{attr_name} #{attribute_condition(value)}"
|
|
condition_params = [value]
|
|
else
|
|
# sqlite has case sensitive SELECT query, while MySQL/Postgresql don't.
|
|
# Hence, this is needed only for sqlite.
|
|
condition_sql = "LOWER(#{record.class.quoted_table_name}.#{attr_name}) #{attribute_condition(value)}"
|
|
condition_params = [value.chars.downcase]
|
|
end
|
|
|
|
if scope = configuration[:scope]
|
|
Array(scope).map do |scope_item|
|
|
scope_value = record.send(scope_item)
|
|
condition_sql << " AND #{record.class.quoted_table_name}.#{scope_item} #{attribute_condition(scope_value)}"
|
|
condition_params << scope_value
|
|
end
|
|
end
|
|
|
|
unless record.new_record?
|
|
condition_sql << " AND #{record.class.quoted_table_name}.#{record.class.primary_key} <> ?"
|
|
condition_params << record.send(:id)
|
|
end
|
|
|
|
results = finder_class.with_exclusive_scope do
|
|
connection.select_all(
|
|
construct_finder_sql(
|
|
:select => "#{connection.quote_column_name(attr_name)}",
|
|
:from => "#{finder_class.quoted_table_name}",
|
|
:conditions => [condition_sql, *condition_params]
|
|
)
|
|
)
|
|
end
|
|
|
|
unless results.length.zero?
|
|
found = true
|
|
|
|
# As MySQL/Postgres don't have case sensitive SELECT queries, we try to find duplicate
|
|
# column in ruby when case sensitive option
|
|
if configuration[:case_sensitive] && finder_class.columns_hash[attr_name.to_s].text?
|
|
found = results.any? { |a| a[attr_name.to_s] == value }
|
|
end
|
|
|
|
record.errors.add(attr_name, configuration[:message]) if found
|
|
end
|
|
end
|
|
end
|
|
|
|
|
|
# Validates whether the value of the specified attribute is of the correct form by matching it against the regular expression
|
|
# provided.
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
|
|
# end
|
|
#
|
|
# Note: use <tt>\A</tt> and <tt>\Z</tt> to match the start and end of the string, <tt>^</tt> and <tt>$</tt> match the start/end of a line.
|
|
#
|
|
# A regular expression must be provided or else an exception will be raised.
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:message</tt> - A custom error message (default is: "is invalid").
|
|
# * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
|
|
# * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
|
|
# * <tt>:with</tt> - The regular expression used to validate the format with (note: must be supplied!).
|
|
# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
def validates_format_of(*attr_names)
|
|
configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save, :with => nil }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
raise(ArgumentError, "A regular expression must be supplied as the :with option of the configuration hash") unless configuration[:with].is_a?(Regexp)
|
|
|
|
validates_each(attr_names, configuration) do |record, attr_name, value|
|
|
record.errors.add(attr_name, configuration[:message] % value) unless value.to_s =~ configuration[:with]
|
|
end
|
|
end
|
|
|
|
# Validates whether the value of the specified attribute is available in a particular enumerable object.
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_inclusion_of :gender, :in => %w( m f ), :message => "woah! what are you then!??!!"
|
|
# validates_inclusion_of :age, :in => 0..99
|
|
# validates_inclusion_of :format, :in => %w( jpg gif png ), :message => "extension %s is not included in the list"
|
|
# end
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:in</tt> - An enumerable object of available items.
|
|
# * <tt>:message</tt> - Specifies a custom error message (default is: "is not included in the list").
|
|
# * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
|
|
# * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
def validates_inclusion_of(*attr_names)
|
|
configuration = { :message => ActiveRecord::Errors.default_error_messages[:inclusion], :on => :save }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
enum = configuration[:in] || configuration[:within]
|
|
|
|
raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?("include?")
|
|
|
|
validates_each(attr_names, configuration) do |record, attr_name, value|
|
|
record.errors.add(attr_name, configuration[:message] % value) unless enum.include?(value)
|
|
end
|
|
end
|
|
|
|
# Validates that the value of the specified attribute is not in a particular enumerable object.
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here"
|
|
# validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60"
|
|
# validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension %s is not allowed"
|
|
# end
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:in</tt> - An enumerable object of items that the value shouldn't be part of.
|
|
# * <tt>:message</tt> - Specifies a custom error message (default is: "is reserved").
|
|
# * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
|
|
# * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
def validates_exclusion_of(*attr_names)
|
|
configuration = { :message => ActiveRecord::Errors.default_error_messages[:exclusion], :on => :save }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
enum = configuration[:in] || configuration[:within]
|
|
|
|
raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?("include?")
|
|
|
|
validates_each(attr_names, configuration) do |record, attr_name, value|
|
|
record.errors.add(attr_name, configuration[:message] % value) if enum.include?(value)
|
|
end
|
|
end
|
|
|
|
# Validates whether the associated object or objects are all valid themselves. Works with any kind of association.
|
|
#
|
|
# class Book < ActiveRecord::Base
|
|
# has_many :pages
|
|
# belongs_to :library
|
|
#
|
|
# validates_associated :pages, :library
|
|
# end
|
|
#
|
|
# Warning: If, after the above definition, you then wrote:
|
|
#
|
|
# class Page < ActiveRecord::Base
|
|
# belongs_to :book
|
|
#
|
|
# validates_associated :book
|
|
# end
|
|
#
|
|
# this would specify a circular dependency and cause infinite recursion.
|
|
#
|
|
# NOTE: This validation will not fail if the association hasn't been assigned. If you want to ensure that the association
|
|
# is both present and guaranteed to be valid, you also need to use +validates_presence_of+.
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:message</tt> - A custom error message (default is: "is invalid")
|
|
# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
def validates_associated(*attr_names)
|
|
configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
validates_each(attr_names, configuration) do |record, attr_name, value|
|
|
record.errors.add(attr_name, configuration[:message]) unless
|
|
(value.is_a?(Array) ? value : [value]).inject(true) { |v, r| (r.nil? || r.valid?) && v }
|
|
end
|
|
end
|
|
|
|
# Validates whether the value of the specified attribute is numeric by trying to convert it to
|
|
# a float with Kernel.Float (if <tt>only_integer</tt> is false) or applying it to the regular expression
|
|
# <tt>/\A[\+\-]?\d+\Z/</tt> (if <tt>only_integer</tt> is set to true).
|
|
#
|
|
# class Person < ActiveRecord::Base
|
|
# validates_numericality_of :value, :on => :create
|
|
# end
|
|
#
|
|
# Configuration options:
|
|
# * <tt>:message</tt> - A custom error message (default is: "is not a number").
|
|
# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
|
|
# * <tt>:only_integer</tt> - Specifies whether the value has to be an integer, e.g. an integral value (default is +false+).
|
|
# * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is +false+). Notice that for fixnum and float columns empty strings are converted to +nil+.
|
|
# * <tt>:greater_than</tt> - Specifies the value must be greater than the supplied value.
|
|
# * <tt>:greater_than_or_equal_to</tt> - Specifies the value must be greater than or equal the supplied value.
|
|
# * <tt>:equal_to</tt> - Specifies the value must be equal to the supplied value.
|
|
# * <tt>:less_than</tt> - Specifies the value must be less than the supplied value.
|
|
# * <tt>:less_than_or_equal_to</tt> - Specifies the value must be less than or equal the supplied value.
|
|
# * <tt>:odd</tt> - Specifies the value must be an odd number.
|
|
# * <tt>:even</tt> - Specifies the value must be an even number.
|
|
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
|
|
# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
|
|
# method, proc or string should return or evaluate to a true or false value.
|
|
def validates_numericality_of(*attr_names)
|
|
configuration = { :on => :save, :only_integer => false, :allow_nil => false }
|
|
configuration.update(attr_names.extract_options!)
|
|
|
|
|
|
numericality_options = ALL_NUMERICALITY_CHECKS.keys & configuration.keys
|
|
|
|
(numericality_options - [ :odd, :even ]).each do |option|
|
|
raise ArgumentError, ":#{option} must be a number" unless configuration[option].is_a?(Numeric)
|
|
end
|
|
|
|
validates_each(attr_names,configuration) do |record, attr_name, value|
|
|
raw_value = record.send("#{attr_name}_before_type_cast") || value
|
|
|
|
next if configuration[:allow_nil] and raw_value.nil?
|
|
|
|
if configuration[:only_integer]
|
|
unless raw_value.to_s =~ /\A[+-]?\d+\Z/
|
|
record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number])
|
|
next
|
|
end
|
|
raw_value = raw_value.to_i
|
|
else
|
|
begin
|
|
raw_value = Kernel.Float(raw_value)
|
|
rescue ArgumentError, TypeError
|
|
record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number])
|
|
next
|
|
end
|
|
end
|
|
|
|
numericality_options.each do |option|
|
|
case option
|
|
when :odd, :even
|
|
record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[option]) unless raw_value.to_i.method(ALL_NUMERICALITY_CHECKS[option])[]
|
|
else
|
|
message = configuration[:message] || ActiveRecord::Errors.default_error_messages[option]
|
|
message = message % configuration[option] if configuration[option]
|
|
record.errors.add(attr_name, message) unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]]
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
# Creates an object just like Base.create but calls save! instead of save
|
|
# so an exception is raised if the record is invalid.
|
|
def create!(attributes = nil, &block)
|
|
if attributes.is_a?(Array)
|
|
attributes.collect { |attr| create!(attr, &block) }
|
|
else
|
|
object = new(attributes)
|
|
yield(object) if block_given?
|
|
object.save!
|
|
object
|
|
end
|
|
end
|
|
|
|
private
|
|
def validation_method(on)
|
|
case on
|
|
when :save then :validate
|
|
when :create then :validate_on_create
|
|
when :update then :validate_on_update
|
|
end
|
|
end
|
|
end
|
|
|
|
# The validation process on save can be skipped by passing false. The regular Base#save method is
|
|
# replaced with this when the validations module is mixed in, which it is by default.
|
|
def save_with_validation(perform_validation = true)
|
|
if perform_validation && valid? || !perform_validation
|
|
save_without_validation
|
|
else
|
|
false
|
|
end
|
|
end
|
|
|
|
# Attempts to save the record just like Base#save but will raise a RecordInvalid exception instead of returning false
|
|
# if the record is not valid.
|
|
def save_with_validation!
|
|
if valid?
|
|
save_without_validation!
|
|
else
|
|
raise RecordInvalid.new(self)
|
|
end
|
|
end
|
|
|
|
# Updates a single attribute and saves the record without going through the normal validation procedure.
|
|
# This is especially useful for boolean flags on existing records. The regular +update_attribute+ method
|
|
# in Base is replaced with this when the validations module is mixed in, which it is by default.
|
|
def update_attribute_with_validation_skipping(name, value)
|
|
send(name.to_s + '=', value)
|
|
save(false)
|
|
end
|
|
|
|
# Runs +validate+ and +validate_on_create+ or +validate_on_update+ and returns true if no errors were added otherwise false.
|
|
def valid?
|
|
errors.clear
|
|
|
|
run_callbacks(:validate)
|
|
validate
|
|
|
|
if new_record?
|
|
run_callbacks(:validate_on_create)
|
|
validate_on_create
|
|
else
|
|
run_callbacks(:validate_on_update)
|
|
validate_on_update
|
|
end
|
|
|
|
errors.empty?
|
|
end
|
|
|
|
# Returns the Errors object that holds all information about attribute error messages.
|
|
def errors
|
|
@errors ||= Errors.new(self)
|
|
end
|
|
|
|
protected
|
|
# Overwrite this method for validation checks on all saves and use <tt>Errors.add(field, msg)</tt> for invalid attributes.
|
|
def validate #:doc:
|
|
end
|
|
|
|
# Overwrite this method for validation checks used only on creation.
|
|
def validate_on_create #:doc:
|
|
end
|
|
|
|
# Overwrite this method for validation checks used only on updates.
|
|
def validate_on_update # :doc:
|
|
end
|
|
end
|
|
end
|