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Add simple attribute implementation backed by ivars

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1 parent d5d5923 commit af5301089f38b9aad9a92424d5fa8f9a9b27c4e1 @josh josh committed Jun 18, 2009
@@ -26,6 +26,7 @@
require 'active_support'
module ActiveModel
+ autoload :Attributes, 'active_model/attributes'
autoload :Base, 'active_model/base'
autoload :DeprecatedErrorMethods, 'active_model/deprecated_error_methods'
autoload :Errors, 'active_model/errors'
@@ -0,0 +1,17 @@
+require 'active_support/core_ext/object/instance_variables'
+
+module ActiveModel
+ module Attributes
+ def attributes
+ instance_values
+ end
+
+ def read_attribute(attr_name)
+ instance_variable_get(:"@#{attr_name}")
+ end
+
+ def write_attribute(attr_name, value)
+ instance_variable_set(:"@#{attr_name}", value)
+ end
+ end
+end
@@ -0,0 +1,30 @@
+require 'cases/helper'
+
+class AttributesTest < ActiveModel::TestCase
+ class Person
+ include ActiveModel::Attributes
+ attr_accessor :name
+ end
+
+ test "reads attribute" do
+ p = Person.new
+ assert_equal nil, p.read_attribute(:name)
+
+ p.name = "Josh"
+ assert_equal "Josh", p.read_attribute(:name)
+ end
+
+ test "writes attribute" do
+ p = Person.new
+ assert_equal nil, p.name
+
+ p.write_attribute(:name, "Josh")
+ assert_equal "Josh", p.name
+ end
+
+ test "returns all attributes" do
+ p = Person.new
+ p.name = "Josh"
+ assert_equal({"name" => "Josh"}, p.attributes)
+ end
+end

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