module ActiveModel module Validations class InclusionValidator < EachValidator def check_validity! raise ArgumentError, "An object with the method include? is required must be supplied as the " << ":in option of the configuration hash" unless options[:in].respond_to?(:include?) end def validate_each(record, attribute, value) return if options[:in].include?(value) record.errors.add(attribute, :inclusion, :default => options[:message], :value => value) end end module ClassMethods # 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 ) # validates_inclusion_of :age, :in => 0..99 # validates_inclusion_of :format, :in => %w( jpg gif png ), :message => "extension {{value}} 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) validates_with InclusionValidator, _merge_attributes(attr_names) end end end end