Methods

Instance Public methods

after_validation(*args, &block)

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
📝 Source code 
# File activemodel/lib/active_model/validations/callbacks.rb, line 97
        def after_validation(*args, &block)
          options = args.extract_options!
          options = options.dup
          options[:prepend] = true

          if options.key?(:on)
            options[:on] = Array(options[:on])
            options[:if] = Array(options[:if])
            options[:if].unshift ->(o) {
              !(options[:on] & Array(o.validation_context)).empty?
            }
          end

          set_callback(:validation, :after, *args, options, &block)
        end
🔎 See on GitHub

before_validation(*args, &block)

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"
📝 Source code 
# File activemodel/lib/active_model/validations/callbacks.rb, line 56
        def before_validation(*args, &block)
          options = args.extract_options!

          if options.key?(:on)
            options = options.dup
            options[:on] = Array(options[:on])
            options[:if] = Array(options[:if])
            options[:if].unshift ->(o) {
              !(options[:on] & Array(o.validation_context)).empty?
            }
          end

          set_callback(:validation, :before, *args, options, &block)
        end
🔎 See on GitHub