initial experimental commit of active_model

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8118 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

2 files changed, 137 insertions, 0 deletions

diff --git a/activemodel/spec/observing_spec.rb b/activemodel/spec/observing_spec.rb
new file mode 100644
index 0000000000..1919bb5991
--- /dev/null
+++ b/activemodel/spec/observing_spec.rb
@@ -0,0 +1,120 @@
+require File.join(File.dirname(__FILE__), 'spec_helper')
+
+class ObservedModel < ActiveModel::Base
+  class Observer
+  end
+end
+
+class FooObserver < ActiveModel::Observer
+  class << self
+    public :new
+  end
+  
+  attr_accessor :stub
+
+  def on_spec(record)
+    stub.event_with(record) if stub
+  end
+end
+
+class Foo < ActiveModel::Base
+end
+
+module ActiveModel
+  describe Observing do
+    before do
+      ObservedModel.observers.clear
+    end
+
+    it "initializes model with no cached observers" do
+      ObservedModel.observers.should be_empty
+    end
+    
+    it "stores cached observers in an array" do
+      ObservedModel.observers << :foo
+      ObservedModel.observers.should include(:foo)
+    end
+    
+    it "flattens array of assigned cached observers" do
+      ObservedModel.observers = [[:foo], :bar]
+      ObservedModel.observers.should include(:foo)
+      ObservedModel.observers.should include(:bar)
+    end
+    
+    it "instantiates observer names passed as strings" do
+      ObservedModel.observers << 'foo_observer'
+      FooObserver.should_receive(:instance)
+      ObservedModel.instantiate_observers
+    end
+    
+    it "instantiates observer names passed as symbols" do
+      ObservedModel.observers << :foo_observer
+      FooObserver.should_receive(:instance)
+      ObservedModel.instantiate_observers
+    end
+    
+    it "instantiates observer classes" do
+      ObservedModel.observers << ObservedModel::Observer
+      ObservedModel::Observer.should_receive(:instance)
+      ObservedModel.instantiate_observers
+    end
+    
+    it "should pass observers to subclasses" do
+      FooObserver.instance
+      bar = Class.new(Foo)
+      bar.count_observers.should == 1
+    end
+  end
+  
+  describe Observer do
+    before do
+      ObservedModel.observers = :foo_observer
+      FooObserver.models = nil
+    end
+
+    it "guesses implicit observable model name" do
+      FooObserver.observed_class_name.should == 'Foo'
+    end
+
+    it "tracks implicit observable models" do
+      instance = FooObserver.new
+      instance.send(:observed_classes).should     include(Foo)
+      instance.send(:observed_classes).should_not include(ObservedModel)
+    end
+    
+    it "tracks explicit observed model class" do
+      FooObserver.new.send(:observed_classes).should_not include(ObservedModel)
+      FooObserver.observe ObservedModel
+      instance = FooObserver.new
+      instance.send(:observed_classes).should include(ObservedModel)
+    end
+    
+    it "tracks explicit observed model as string" do
+      FooObserver.new.send(:observed_classes).should_not include(ObservedModel)
+      FooObserver.observe 'observed_model'
+      instance = FooObserver.new
+      instance.send(:observed_classes).should include(ObservedModel)
+    end
+    
+    it "tracks explicit observed model as symbol" do
+      FooObserver.new.send(:observed_classes).should_not include(ObservedModel)
+      FooObserver.observe :observed_model
+      instance = FooObserver.new
+      instance.send(:observed_classes).should include(ObservedModel)
+    end
+    
+    it "calls existing observer event" do
+      foo = Foo.new
+      FooObserver.instance.stub = stub!(:stub)
+      FooObserver.instance.stub.should_receive(:event_with).with(foo)
+      Foo.send(:changed)
+      Foo.send(:notify_observers, :on_spec, foo)
+    end
+    
+    it "skips nonexistent observer event" do
+      foo = Foo.new
+      Foo.send(:changed)
+      Foo.send(:notify_observers, :whatever, foo)
+    end
+  end
+end
\ No newline at end of file
diff --git a/activemodel/spec/spec_helper.rb b/activemodel/spec/spec_helper.rb
new file mode 100644
index 0000000000..004fdfca07
--- /dev/null
+++ b/activemodel/spec/spec_helper.rb
@@ -0,0 +1,17 @@
+ENV['LOG_NAME'] = 'spec'
+$LOAD_PATH << File.join(File.dirname(__FILE__), '..', 'vendor', 'rspec', 'lib')
+$LOAD_PATH << File.join(File.dirname(__FILE__), '..', 'lib')
+require 'active_model'
+begin
+  require 'spec'
+rescue LoadError
+  require 'rubygems'
+  require 'spec'
+end
+
+begin
+  require 'ruby-debug'
+  Debugger.start
+rescue LoadError
+  # you do not know the ways of ruby-debug yet, what a shame
+end
\ No newline at end of file