291 lines
9.9 KiB
Ruby
291 lines
9.9 KiB
Ruby
module ActiveResource
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class ResourceInvalid < ClientError #:nodoc:
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end
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# Active Resource validation is reported to and from this object, which is used by Base#save
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# to determine whether the object 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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attr_reader :errors
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delegate :empty?, :to => :errors
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def initialize(base) # :nodoc:
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@base, @errors = base, {}
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end
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# Add an error to the base Active Resource object rather than an attribute.
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#
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# ==== Examples
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# my_folder = Folder.find(1)
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# my_folder.errors.add_to_base("You can't edit an existing folder")
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# my_folder.errors.on_base
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# # => "You can't edit an existing folder"
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#
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# my_folder.errors.add_to_base("This folder has been tagged as frozen")
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# my_folder.valid?
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# # => false
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# my_folder.errors.on_base
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# # => ["You can't edit an existing folder", "This folder has been tagged as frozen"]
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#
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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 to an Active Resource object's attribute (named for the +attribute+ parameter)
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# with the error message in +msg+.
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#
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# ==== Examples
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# my_resource = Node.find(1)
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# my_resource.errors.add('name', 'can not be "base"') if my_resource.name == 'base'
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# my_resource.errors.on('name')
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# # => 'can not be "base"!'
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#
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# my_resource.errors.add('desc', 'can not be blank') if my_resource.desc == ''
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# my_resource.valid?
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# # => false
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# my_resource.errors.on('desc')
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# # => 'can not be blank!'
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#
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def add(attribute, msg)
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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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# Returns true if the specified +attribute+ has errors associated with it.
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#
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# ==== Examples
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# my_resource = Disk.find(1)
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# my_resource.errors.add('location', 'must be Main') unless my_resource.location == 'Main'
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# my_resource.errors.on('location')
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# # => 'must be Main!'
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#
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# my_resource.errors.invalid?('location')
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# # => true
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# my_resource.errors.invalid?('name')
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# # => 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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# A method to return the errors associated with +attribute+, which returns nil, if no errors are
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# associated with the specified +attribute+, the error message if one error is associated with the specified +attribute+,
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# or an array of error messages if more than one error is associated with the specified +attribute+.
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#
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# ==== Examples
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# my_person = Person.new(params[:person])
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# my_person.errors.on('login')
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# # => nil
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#
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# my_person.errors.add('login', 'can not be empty') if my_person.login == ''
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# my_person.errors.on('login')
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# # => 'can not be empty'
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#
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# my_person.errors.add('login', 'can not be longer than 10 characters') if my_person.login.length > 10
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# my_person.errors.on('login')
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# # => ['can not be empty', 'can not be longer than 10 characters']
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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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# A method to return errors assigned to +base+ object through add_to_base, which returns nil, if no errors are
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# associated with the specified +attribute+, the error message if one error is associated with the specified +attribute+,
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# or an array of error messages if more than one error is associated with the specified +attribute+.
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#
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# ==== Examples
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# my_account = Account.find(1)
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# my_account.errors.on_base
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# # => nil
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#
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# my_account.errors.add_to_base("This account is frozen")
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# my_account.errors.on_base
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# # => "This account is frozen"
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#
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# my_account.errors.add_to_base("This account has been closed")
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# my_account.errors.on_base
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# # => ["This account is frozen", "This account has been closed"]
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#
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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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# ==== Examples
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# my_person = Person.new(params[:person])
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#
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# my_person.errors.add('login', 'can not be empty') if my_person.login == ''
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# my_person.errors.add('password', 'can not be empty') if my_person.password == ''
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# messages = ''
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# my_person.errors.each {|attr, msg| messages += attr.humanize + " " + msg + "<br />"}
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# messages
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# # => "Login can not be empty<br />Password can not be empty<br />"
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#
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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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# ==== Examples
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# my_person = Person.new(params[:person])
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#
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# my_person.errors.add('login', 'can not be empty') if my_person.login == ''
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# my_person.errors.add('password', 'can not be empty') if my_person.password == ''
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# messages = ''
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# my_person.errors.each_full {|msg| messages += msg + "<br/>"}
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# messages
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# # => "Login can not be empty<br />Password can not be empty<br />"
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#
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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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# ==== Examples
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# my_person = Person.new(params[:person])
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#
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# my_person.errors.add('login', 'can not be empty') if my_person.login == ''
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# my_person.errors.add('password', 'can not be empty') if my_person.password == ''
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# messages = ''
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# my_person.errors.full_messages.each {|msg| messages += msg + "<br/>"}
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# messages
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# # => "Login can not be empty<br />Password can not be empty<br />"
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#
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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 << [attr.humanize, msg].join(' ')
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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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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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# with this as well.
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#
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# ==== Examples
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# my_person = Person.new(params[:person])
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# my_person.errors.size
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# # => 0
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#
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# my_person.errors.add('login', 'can not be empty') if my_person.login == ''
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# my_person.errors.add('password', 'can not be empty') if my_person.password == ''
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# my_person.error.size
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# # => 2
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#
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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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# Grabs errors from an array of messages (like ActiveRecord::Validations)
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def from_array(messages)
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clear
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humanized_attributes = @base.attributes.keys.inject({}) { |h, attr_name| h.update(attr_name.humanize => attr_name) }
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messages.each do |message|
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attr_message = humanized_attributes.keys.detect do |attr_name|
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if message[0, attr_name.size + 1] == "#{attr_name} "
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add humanized_attributes[attr_name], message[(attr_name.size + 1)..-1]
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end
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end
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add_to_base message if attr_message.nil?
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end
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end
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# Grabs errors from the json response.
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def from_json(json)
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array = ActiveSupport::JSON.decode(json)['errors'] rescue []
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from_array array
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end
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# Grabs errors from the XML response.
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def from_xml(xml)
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array = Array.wrap(Hash.from_xml(xml)['errors']['error']) rescue []
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from_array array
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end
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end
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# Module to support validation and errors with Active Resource objects. The module overrides
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# Base#save to rescue ActiveResource::ResourceInvalid exceptions and parse the errors returned
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# in the web service response. The module also adds an +errors+ collection that mimics the interface
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# of the errors provided by ActiveRecord::Errors.
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#
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# ==== Example
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#
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# Consider a Person resource on the server requiring both a +first_name+ and a +last_name+ with a
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# <tt>validates_presence_of :first_name, :last_name</tt> declaration in the model:
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#
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# person = Person.new(:first_name => "Jim", :last_name => "")
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# person.save # => false (server returns an HTTP 422 status code and errors)
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# person.valid? # => false
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# person.errors.empty? # => false
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# person.errors.count # => 1
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# person.errors.full_messages # => ["Last name can't be empty"]
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# person.errors.on(:last_name) # => "can't be empty"
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# person.last_name = "Halpert"
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# person.save # => true (and person is now saved to the remote service)
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#
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module Validations
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def self.included(base) # :nodoc:
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base.class_eval do
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alias_method_chain :save, :validation
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end
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end
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# Validate a resource and save (POST) it to the remote web service.
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def save_with_validation
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save_without_validation
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true
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rescue ResourceInvalid => error
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case self.class.format
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when ActiveResource::Formats[:xml]
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errors.from_xml(error.response.body)
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when ActiveResource::Formats[:json]
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errors.from_json(error.response.body)
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end
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false
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end
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# Checks for errors on an object (i.e., is resource.errors empty?).
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#
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# ==== Examples
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# my_person = Person.create(params[:person])
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# my_person.valid?
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# # => true
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#
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# my_person.errors.add('login', 'can not be empty') if my_person.login == ''
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# my_person.valid?
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# # => false
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def valid?
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errors.empty?
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end
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# Returns the Errors object that holds all information about attribute error messages.
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def errors
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@errors ||= Errors.new(self)
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end
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end
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end
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