module ActiveModel module Validations 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: # * <tt>:message</tt> - A custom error message (default is: "doesn't match confirmation") # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>) # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The # method, proc or string should return or evaluate to a true or false value. # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The # method, proc or string should return or evaluate to a true or false value. def validates_confirmation_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:confirmation], :on => :save } configuration.update(attr_names.extract_options!) attr_accessor(*(attr_names.map { |n| "#{n}_confirmation" })) validates_each(attr_names, configuration) do |record, attr_name, value| record.errors.add(attr_name, configuration[:message]) unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation") end end end end end