# module ActiveModel::Validations::Callbacks::ClassMethods

### Public Instance Methods

after_validation(*args, &block) click to toggle source

Defines a callback that will get called right after validation.

    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

    # File lib/active_model/validations/callbacks.rb, line 92
    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

before_validation(*args, &block) click to toggle source

Defines a callback that will get called right before validation.

    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"

    # File lib/active_model/validations/callbacks.rb, line 54
    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