module ActiveModel module Validations class ConfirmationValidator < EachValidator def validate_each(record, attribute, value) confirmed = record.send(:"#{attribute}_confirmation") return if confirmed.nil? || value == confirmed record.errors.add(attribute, :confirmation, :default => options[:message]) end def setup(klass) klass.send(:attr_accessor, *attributes.map { |attribute| :"#{attribute}_confirmation" }) end end module ClassMethods # Encapsulates the pattern of wanting to validate a password or email address field with a confirmation. Example: # # Model: # class Person < ActiveRecord::Base # validates_confirmation_of :user_name, :password # validates_confirmation_of :email_address, :message => "should match confirmation" # end # # View: # <%= password_field "person", "password" %> # <%= password_field "person", "password_confirmation" %> # # The added +password_confirmation+ attribute is virtual; it exists only as an in-memory attribute for validating the password. # To achieve this, the validation adds accessors to the model for the confirmation attribute. NOTE: This check is performed # only if +password_confirmation+ is not +nil+, and by default only on save. To require confirmation, make sure to add a presence # check for the confirmation attribute: # # validates_presence_of :password_confirmation, :if => :password_changed? # # Configuration options: # * :message - A custom error message (default is: "doesn't match confirmation"). # * :on - Specifies when this validation is active (default is :save, other options :create, :update). # * :if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. # * :unless - Specifies a method, proc or string to call to determine if the validation should # not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_confirmation_of(*attr_names) validates_with ConfirmationValidator, _merge_attributes(attr_names) end end end end