Don't make me have to manually add a model to the collection if it ha…

…s an id attribute.

src/model_instance_methods.js

@@ -35,10 +35,10 @@ Model.InstanceMethods = {
 
     // Automatically manage adding and removing from the model's Collection.
     var manageCollection = function() {
-      if (method === "create") {
-        self.constructor.add(self);
-      } else if (method === "destroy") {
+      if (method === "destroy") {
         self.constructor.remove(self)
+      } else {
+        self.constructor.add(self)
       }
     };
 

test/tests/model.js

@@ -270,3 +270,10 @@ test("#initialize", function() {
 
   ok(post.initialized)
 })
+
+test("saving a model with an id should add it to the collection if it isn't already present", function() {
+  var Post = Model("post")
+  var post = new Post({ id: 1 }).save()
+
+  ok(Post.first() === post)
+})