Flowdock
method

validates_confirmation_of

Importance_2
validates_confirmation_of(*attr_names) public

Encapsulates the pattern of wanting to validate a password or email address field with a confirmation.

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. 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”).

There is also a list of default options supported by every validator: :if, :unless, :on and :strict. See ActiveModel::Validation#validates for more information

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