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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 <tt>before_*</tt> callbacks if +before_validation+ returns
# +false+ then <tt>valid?</tt> will not be called.
module Callbacks
extend ActiveSupport::Concern
included do
include ActiveSupport::Callbacks
define_callbacks :validation,
terminator: ->(_,result) { result == false },
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 lambda { |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("#{options[:on]}.include? self.validation_context")
end
set_callback(:validation, :after, *(args << options), &block)
end
end
protected
# Overwrite run validations to include callbacks.
def run_validations! #:nodoc:
run_validation_callbacks { super }
end
end
end
end
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