JezK
Edit File: exclusion.rb
require 'active_support/core_ext/range' module ActiveModel # == Active Model Exclusion Validator module Validations class ExclusionValidator < EachValidator ERROR_MESSAGE = "An object with the method #include? or a proc or lambda is required, " << "and must be supplied as the :in (or :within) option of the configuration hash" def check_validity! unless [:include?, :call].any? { |method| delimiter.respond_to?(method) } raise ArgumentError, ERROR_MESSAGE end end def validate_each(record, attribute, value) exclusions = delimiter.respond_to?(:call) ? delimiter.call(record) : delimiter if exclusions.send(inclusion_method(exclusions), value) record.errors.add(attribute, :exclusion, options.except(:in, :within).merge!(:value => value)) end end private def delimiter @delimiter ||= options[:in] || options[:within] end # 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 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 => lambda { |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> # (backported in Active Support for 1.8), otherwise with <tt>include?</tt>. # * <tt>:within</tt> - A synonym(or alias) for <tt>:in</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