module ActiveModel
module Validations
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)
configuration = 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|
unless enum.include?(value)
record.errors.add(attr_name, :inclusion, :default => configuration[:message], :value => value)
end
end
end
end
end
end
