module ActiveModel module Validations # == Active \Model \Validation \Callbacks # # Provides an interface for any class to have +before_validation+ and # +after_validation+ callbacks. # # First, include ActiveModel::Validations::Callbacks from the class you are # creating: # # class MyModel # include ActiveModel::Validations::Callbacks # # before_validation :do_stuff_before_validation # after_validation :do_stuff_after_validation # end # # Like other before_* callbacks if +before_validation+ throws # +:abort+ then valid? will not be called. module Callbacks extend ActiveSupport::Concern included do include ActiveSupport::Callbacks define_callbacks :validation, skip_after_callbacks_if_terminated: true, scope: [:kind, :name] end module ClassMethods # Defines a callback that will get called right before validation # happens. # # class Person # include ActiveModel::Validations # include ActiveModel::Validations::Callbacks # # attr_accessor :name # # validates_length_of :name, maximum: 6 # # before_validation :remove_whitespaces # # private # # def remove_whitespaces # name.strip! # end # end # # person = Person.new # person.name = ' bob ' # person.valid? # => true # person.name # => "bob" def before_validation(*args, &block) options = args.last if options.is_a?(Hash) && options[:on] options[:if] = Array(options[:if]) options[:on] = Array(options[:on]) options[:if].unshift ->(o) { options[:on].include? o.validation_context } end set_callback(:validation, :before, *args, &block) end # Defines a callback that will get called right after validation # happens. # # class Person # include ActiveModel::Validations # include ActiveModel::Validations::Callbacks # # attr_accessor :name, :status # # validates_presence_of :name # # after_validation :set_status # # private # # def set_status # self.status = errors.empty? # end # end # # person = Person.new # person.name = '' # person.valid? # => false # person.status # => false # person.name = 'bob' # person.valid? # => true # person.status # => true def after_validation(*args, &block) options = args.extract_options! options[:prepend] = true options[:if] = Array(options[:if]) if options[:on] options[:on] = Array(options[:on]) options[:if].unshift ->(o) { options[:on].include? o.validation_context } end set_callback(:validation, :after, *(args << options), &block) end end protected # Overwrite run validations to include callbacks. def run_validations! #:nodoc: run_callbacks(:validation) { super } end end end end