module ActiveModel
module Validations
class ExclusionValidator < 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 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:
# * <tt>:in</tt> - An enumerable object of items that the value shouldn't be part of.
# * <tt>:message</tt> - Specifies a custom error message (default is: "is reserved").
# * <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_exclusion_of(*attr_names)
validates_with ExclusionValidator, _merge_attributes(attr_names)
end
end
end
end
