141 lines
3.4 KiB
Ruby
Executable file
141 lines
3.4 KiB
Ruby
Executable file
require "cases/helper"
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require 'models/topic'
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require 'models/developer'
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require 'models/reply'
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class Topic; def after_find() end end
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class Developer; def after_find() end end
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class SpecialDeveloper < Developer; end
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class TopicManualObserver
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include Singleton
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attr_reader :action, :object, :callbacks
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def initialize
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Topic.add_observer(self)
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@callbacks = []
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end
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def update(callback_method, object)
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@callbacks << { "callback_method" => callback_method, "object" => object }
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end
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def has_been_notified?
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!@callbacks.empty?
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end
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end
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class TopicaAuditor < ActiveRecord::Observer
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observe :topic
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attr_reader :topic
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def after_find(topic)
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@topic = topic
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end
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end
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class TopicObserver < ActiveRecord::Observer
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attr_reader :topic
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def after_find(topic)
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@topic = topic
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end
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end
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class MultiObserver < ActiveRecord::Observer
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attr_reader :record
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def self.observed_class() [ Topic, Developer ] end
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cattr_reader :last_inherited
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@@last_inherited = nil
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def observed_class_inherited_with_testing(subclass)
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observed_class_inherited_without_testing(subclass)
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@@last_inherited = subclass
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end
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alias_method_chain :observed_class_inherited, :testing
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def after_find(record)
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@record = record
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end
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end
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class LifecycleTest < ActiveRecord::TestCase
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fixtures :topics, :developers
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def test_before_destroy
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original_count = Topic.count
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(topic_to_be_destroyed = Topic.find(1)).destroy
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assert_equal original_count - (1 + topic_to_be_destroyed.replies.size), Topic.count
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end
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def test_after_save
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ActiveRecord::Base.observers = :topic_manual_observer
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ActiveRecord::Base.instantiate_observers
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topic = Topic.find(1)
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topic.title = "hello"
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topic.save
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assert TopicManualObserver.instance.has_been_notified?
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assert_equal :after_save, TopicManualObserver.instance.callbacks.last["callback_method"]
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end
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def test_observer_update_on_save
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ActiveRecord::Base.observers = TopicManualObserver
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ActiveRecord::Base.instantiate_observers
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topic = Topic.find(1)
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assert TopicManualObserver.instance.has_been_notified?
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assert_equal :after_find, TopicManualObserver.instance.callbacks.first["callback_method"]
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end
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def test_auto_observer
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topic_observer = TopicaAuditor.instance
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assert_nil TopicaAuditor.observed_class
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assert_equal [Topic], TopicaAuditor.instance.observed_classes.to_a
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topic = Topic.find(1)
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assert_equal topic.title, topic_observer.topic.title
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end
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def test_inferred_auto_observer
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topic_observer = TopicObserver.instance
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assert_equal Topic, TopicObserver.observed_class
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topic = Topic.find(1)
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assert_equal topic.title, topic_observer.topic.title
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end
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def test_observing_two_classes
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multi_observer = MultiObserver.instance
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topic = Topic.find(1)
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assert_equal topic.title, multi_observer.record.title
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developer = Developer.find(1)
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assert_equal developer.name, multi_observer.record.name
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end
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def test_observing_subclasses
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multi_observer = MultiObserver.instance
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developer = SpecialDeveloper.find(1)
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assert_equal developer.name, multi_observer.record.name
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klass = Class.new(Developer)
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assert_equal klass, multi_observer.last_inherited
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developer = klass.find(1)
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assert_equal developer.name, multi_observer.record.name
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end
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def test_invalid_observer
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assert_raise(ArgumentError) { Topic.observers = Object.new; Topic.instantiate_observers }
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end
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end
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