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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: show | on GitHub 

# File activemodel/lib/active_model/validations/callbacks.rb, line 88
def after_validation(*args, &block)
  options = args.extract_options!
  options = options.dup
  options[:prepend] = true

  set_options_for_callback(options)

  set_callback(:validation, :after, *args, options, &block)
end

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: show | on GitHub 

# File activemodel/lib/active_model/validations/callbacks.rb, line 55
def before_validation(*args, &block)
  options = args.extract_options!

  set_options_for_callback(options)

  set_callback(:validation, :before, *args, options, &block)
end