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require 'abstract_unit'
require 'fixtures/topic'
require 'fixtures/developer'
class Topic; def after_find() end end
class Developer; def after_find() end end
class TopicManualObserver
include Singleton
attr_reader :action, :object, :callbacks
def initialize
Topic.add_observer(self)
@callbacks = []
end
def update(callback_method, object)
@callbacks << { "callback_method" => callback_method, "object" => object }
end
def has_been_notified?
!@callbacks.empty?
end
end
class TopicaObserver < ActiveRecord::Observer
def self.observed_class() Topic end
attr_reader :topic
def after_find(topic)
@topic = topic
end
end
class TopicObserver < ActiveRecord::Observer
attr_reader :topic
def after_find(topic)
@topic = topic
end
end
class MultiObserver < ActiveRecord::Observer
attr_reader :record
def self.observed_class() [ Topic, Developer ] end
def after_find(record)
@record = record
end
end
class LifecycleTest < Test::Unit::TestCase
def setup
@topics, @developers = create_fixtures("topics", "developers")
end
def test_before_destroy
assert_equal 2, Topic.count
Topic.find(1).destroy
assert_equal 0, Topic.count
end
def test_after_save
topic_observer = TopicManualObserver.instance
topic = Topic.find(1)
topic.title = "hello"
topic.save
assert topic_observer.has_been_notified?
assert_equal :after_save, topic_observer.callbacks.last["callback_method"]
end
def test_observer_update_on_save
topic_observer = TopicManualObserver.instance
topic = Topic.find(1)
assert topic_observer.has_been_notified?
assert_equal :after_find, topic_observer.callbacks.first["callback_method"]
end
def test_auto_observer
topic_observer = TopicaObserver.instance
topic = Topic.find(1)
assert_equal topic_observer.topic.title, topic.title
end
def test_infered_auto_observer
topic_observer = TopicObserver.instance
topic = Topic.find(1)
assert_equal topic_observer.topic.title, topic.title
end
def test_observing_two_classes
multi_observer = MultiObserver.instance
topic = Topic.find(1)
assert_equal multi_observer.record.title, topic.title
developer = Developer.find(1)
assert_equal multi_observer.record.name, developer.name
end
end
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