module ActiveModel module Validations class ExclusionValidator < EachValidator def check_validity! options[:in] ||= options.delete(:within) 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 unless options[:in].include?(value) record.errors.add(attribute, :exclusion, :default => options[:message], :value => value) end end module ClassMethods # Validates that the value of the specified attribute is not in a particular enumerable object. # # class Person < ActiveRecord::Base # validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here" # validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60" # validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension {{value}} is not allowed" # end # # Configuration options: # * :in - An enumerable object of items that the value shouldn't be part of. # * :message - Specifies a custom error message (default is: "is reserved"). # * :allow_nil - If set to true, skips this validation if the attribute is +nil+ (default is +false+). # * :allow_blank - If set to true, skips this validation if the attribute is blank (default is +false+). # * :if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. # * :unless - Specifies a method, proc or string to call to determine if the validation should # not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_exclusion_of(*attr_names) validates_with ExclusionValidator, _merge_attributes(attr_names) end end end end