require "active_model/validations/clusivity"
module ActiveModel
# == Active Model Exclusion Validator
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).merge!(:value => value))
end
end
end
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: ->{ |p| [p.username, p.first_name] },
# message: 'should not be the same as your username or first name'
# 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 or lambda which returns an
# enumerable. If the enumerable is a range the test is performed with
# <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+).
# * <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.
# * <tt>:strict</tt> - Specifies whether validation should be strict.
# See <tt>ActiveModel::Validation#validates!</tt> for more information.
def validates_exclusion_of(*attr_names)
validates_with ExclusionValidator, _merge_attributes(attr_names)
end
end
end
end
