update fixed to call the respective instance method that it was invok…

…ed upon (it used to be invoking a block from the last instance created).

lib/monkeybars/controller.rb

@@ -253,7 +253,12 @@ def close_action
     public
     # Calls the method that was set using Controller.set_update_method.  If no method has been set defined, this call is ignored.
     def update
-      self.class.send(:class_variable_get, :@@update_method).call if self.class.class_variables.member?("@@update_method_name")
+      def update
+        if self.class.class_variables.member?("@@update_method_name")
+          method_name = self.class.send(:class_variable_get, :@@update_method_name) 
+          send(method_name)
+        end
+      end
     end
 
     # Triggers updating of the view based on the mapping and the current contents

spec/unit/controller_spec.rb

@@ -40,6 +40,26 @@ class ExternalModelOverrideTestController < Monkeybars::Controller
     ExternalModelOverrideTestController.send(:view_class).should == "ExternalOverrideTestView"
     ExternalModelOverrideTestController.send(:model_class).should == "ExternalOverrideTestModel"
   end
+
+  it "updates the correct instance on Controller#update" do
+    class MultipleInstanceUpdateController < Monkeybars::Controller
+      set_update_method :tick
+
+      def tick
+        object_id
+      end
+    end
+
+    begin
+      instance1 = MultipleInstanceUpdateController.create_instance
+      instance2 = MultipleInstanceUpdateController.create_instance
+
+      instance1.update.should_not == instance2.update
+    ensure
+      MultipleInstanceUpdateController.destroy_instance instance1
+      MultipleInstanceUpdateController.destroy_instance instance2
+    end
+  end
 end
 
 describe "Controller instantiation" do