added a new validator

lib/couchrest/validation/validators/confirmation_validator.rb

@@ -0,0 +1,103 @@
+# Extracted from dm-validations 0.9.10
+#
+# Copyright (c) 2007 Guy van den Berg
+# 
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module CouchRest
+  module Validation
+
+    ##
+    #
+    # @author Guy van den Berg
+    # @since  0.9
+    class ConfirmationValidator < GenericValidator
+
+      def initialize(field_name, options = {})
+        super
+        @options = options
+        @field_name, @confirm_field_name = field_name, (options[:confirm] || "#{field_name}_confirmation").to_sym
+        @options[:allow_nil] = true unless @options.has_key?(:allow_nil)
+      end
+
+      def call(target)
+        unless valid?(target)
+          error_message = @options[:message] || ValidationErrors.default_error_message(:confirmation, field_name)
+          add_error(target, error_message, field_name)
+          return false
+        end
+
+        return true
+      end
+
+      def valid?(target)
+        field_value = target.send(field_name)
+        return true if @options[:allow_nil] && field_value.nil?
+        return false if !@options[:allow_nil] && field_value.nil?
+
+        if target.class.properties.has_property?(field_name)
+          return true unless target.attribute_dirty?(field_name)
+        end
+
+        confirm_value = target.instance_variable_get("@#{@confirm_field_name}")
+        field_value == confirm_value
+      end
+
+    end # class ConfirmationValidator
+
+    module ValidatesIsConfirmed
+
+      ##
+      # Validates that the given attribute is confirmed by another attribute.
+      # A common use case scenario is when you require a user to confirm their
+      # password, for which you use both password and password_confirmation
+      # attributes.
+      #
+      # @option :allow_nil<Boolean> true/false (default is true)
+      # @option :confirm<Symbol>    the attribute that you want to validate
+      #                             against (default is firstattr_confirmation)
+      #
+      # @example [Usage]
+      #
+      #   class Page < Hash
+      #     include CouchRest::ExtendedModel
+      #     include CouchRest::Validations
+      #
+      #     property :password, String
+      #     property :email, String
+      #     attr_accessor :password_confirmation
+      #     attr_accessor :email_repeated
+      #
+      #     validates_is_confirmed :password
+      #     validates_is_confirmed :email, :confirm => :email_repeated
+      #
+      #     # a call to valid? will return false unless:
+      #     # password == password_confirmation
+      #     # and
+      #     # email == email_repeated
+      #
+      def validates_is_confirmed(*fields)
+        opts = opts_from_validator_args(fields)
+        add_validator_to_context(opts, fields, CouchRest::Validation::ConfirmationValidator)
+      end
+
+    end # module ValidatesIsConfirmed
+  end # module Validation
+end # module CouchRest