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require 'active_support/core_ext/range'
module ActiveModel
# == Active Model Inclusion Validator
module Validations
class InclusionValidator < EachValidator
ERROR_MESSAGE = "An object with the method #include? or a proc or lambda is required, " <<
"and must be supplied as the :in option of the configuration hash"
def check_validity!
unless [:include?, :call].any?{ |method| options[:in].respond_to?(method) }
raise ArgumentError, ERROR_MESSAGE
end
end
def validate_each(record, attribute, value)
delimiter = options[:in]
exclusions = delimiter.respond_to?(:call) ? delimiter.call(record) : delimiter
unless exclusions.send(inclusion_method(exclusions), value)
record.errors.add(attribute, :inclusion, options.except(:in).merge!(:value => value))
end
end
private
# In Ruby 1.9 <tt>Range#include?</tt> on non-numeric ranges checks all possible values in the
# range for equality, so it may be slow for large ranges. The new <tt>Range#cover?</tt>
# uses the previous logic of comparing a value with the range endpoints.
def inclusion_method(enumerable)
enumerable.is_a?(Range) ? :cover? : :include?
end
end
module HelperMethods
# 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"
# validates_inclusion_of :states, :in => lambda{ |person| STATES[person.country] }
# end
#
# Configuration options:
# * <tt>:in</tt> - An enumerable object of available items. This can be
# supplied as a proc or lambda which returns an enumerable. If the enumerable
# is a range the test is performed with <tt>Range#cover?</tt>
# (backported in Active Support for 1.8), otherwise with <tt>include?</tt>.
# * <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>:on</tt> - Specifies when this validation is active. Runs in all
# validation contexts by default (+nil+), other options are <tt>:create</tt>
# and <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_inclusion_of(*attr_names)
validates_with InclusionValidator, _merge_attributes(attr_names)
end
end
end
end
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