vendor/rails/activerecord/lib/active_record/validations.rb
# 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.
Encapsulates the pattern of wanting to validate a password or email address field with a 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.



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 .  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 .  The
method, proc or string should return or evaluate to a true or false value.
Encapsulates the pattern of wanting to validate a password or email address field with a 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 . 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 . 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 . The method proc or string should return or evaluate to a true or false value .
def validates_confirmation_of(*attr_names)
        configuration = { :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|
          unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation")
            record.errors.add(attr_name, :confirmation, :default => configuration[:message]) 
          end
        end
      end
def validates_confirmation_of ( * attr_names ) configuration = { :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 | unless record . send ( "#{attr_name}_confirmation" ) . nil? or value == record . send ( "#{attr_name}_confirmation" ) record . errors . add ( attr_name , :confirmation , :default => configuration [ :message ] ) end end end
Encapsulates the pattern of wanting to validate a password or email address field with a confirmation.
Encapsulates the pattern of wanting to validate a password or email address field with a confirmation .
attr_names