45 lines
2.6 KiB
Ruby
45 lines
2.6 KiB
Ruby
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module ActiveModel
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module Validations
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module ClassMethods
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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 <tt>:terms_of_service</tt> attribute is entirely virtual. This check is
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# performed only if <tt>:terms_of_service</tt> 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 typecasted 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|
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record.errors.add(attr_name, configuration[:message]) unless value == configuration[:accept]
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end
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end
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end
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end
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end
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