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module ActiveModel
module Validations
class ConfirmationValidator < EachValidator # :nodoc:
def initialize(options)
super
setup!(options[:class])
end
def validate_each(record, attribute, value)
if (confirmed = record.send("#{attribute}_confirmation")) && (value != confirmed)
human_attribute_name = record.class.human_attribute_name(attribute)
record.errors.add(:"#{attribute}_confirmation", :confirmation, options.merge(attribute: human_attribute_name))
end
end
private
def setup!(klass)
klass.send(:attr_reader, *attributes.map do |attribute|
:"#{attribute}_confirmation" unless klass.method_defined?(:"#{attribute}_confirmation")
end.compact)
klass.send(:attr_writer, *attributes.map do |attribute|
:"#{attribute}_confirmation" unless klass.method_defined?(:"#{attribute}_confirmation=")
end.compact)
end
end
module HelperMethods
# 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:
# * <tt>:message</tt> - 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+, +:allow_nil+, +:allow_blank+, and +:strict+.
# See <tt>ActiveModel::Validation#validates</tt> for more information
def validates_confirmation_of(*attr_names)
validates_with ConfirmationValidator, _merge_attributes(attr_names)
end
end
end
end
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