module ActiveModel module Validations module ClassMethods # Passes the record off to the class or classes specified and allows them to add errors based on more complex conditions. # # class Person < ActiveRecord::Base # validates_with MyValidator # end # # class MyValidator < ActiveRecord::Validator # def validate # if some_complex_logic # record.errors[:base] << "This record is invalid" # end # end # # private # def some_complex_logic # # ... # end # end # # You may also pass it multiple classes, like so: # # class Person < ActiveRecord::Base # validates_with MyValidator, MyOtherValidator, :on => :create # end # # Configuration options: # * on - Specifies when this validation is active (:create or :update # * 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. # # If you pass any additional configuration options, they will be passed to the class and available as options: # # class Person < ActiveRecord::Base # validates_with MyValidator, :my_custom_key => "my custom value" # end # # class MyValidator < ActiveRecord::Validator # def validate # options[:my_custom_key] # => "my custom value" # end # end # def validates_with(*args) configuration = args.extract_options! send(validation_method(configuration[:on]), configuration) do |record| args.each do |klass| klass.new(record, configuration.except(:on, :if, :unless)).validate end end end end end end