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require "active_model/validations/clusivity"
module ActiveModel
module Validations
class ExclusionValidator < EachValidator # :nodoc:
include Clusivity
def validate_each(record, attribute, value)
if include?(record, value)
record.errors.add(attribute, :exclusion, options.except(:in, :within).merge!(:value => value))
module HelperMethods
# 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"
# validates_exclusion_of :password, in: ->(person) { [person.username, person.first_name] },
# message: 'should not be the same as your username or first name'
# validates_exclusion_of :karma, in: :reserved_karmas
# end
# Configuration options:
# * <tt>:in</tt> - An enumerable object of items that the value shouldn't
# be part of. This can be supplied as a proc, lambda or symbol which returns an
# enumerable. If the enumerable is a range the test is performed with
# * <tt>:within</tt> - A synonym(or alias) for <tt>:in</tt>
# <tt>Range#cover?</tt>, otherwise with <tt>include?</tt>.
# * <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+).
# There is also a list of default options supported by every validator:
# +:if+, +:unless+, +:on+ and +:strict+.
# See <tt>ActiveModel::Validation#validates</tt> for more information
def validates_exclusion_of(*attr_names)
validates_with ExclusionValidator, _merge_attributes(attr_names)
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