Make path-prefixed destroy work for instances

jester.js

@@ -490,27 +490,48 @@ Object.extend(Jester.Resource.prototype, {
       return this;
   },
 
-  // If not given an ID, destroys itself, if it has an ID.  If given an ID, destroys that record.
-  // You can call destroy(), destroy(1), destroy(callback()), or destroy(1, callback()), and it works as you expect.
-  destroy : function(given_id, callback) {
-    if (typeof(given_id) == "function") {
-      callback = given_id;
-      given_id = null;
+  // Destroys a REST object.  Can be used as follows:
+  // object.destroy() - when called on an instance of a model, destroys that instance
+  // Model.destroy(1) - destroys the Model object with ID 1
+  // Model.destroy({parent: 3, id: 1}) - destroys the Model object with Parent ID 3 and ID 1
+  //
+  // Any of these forms can also be passed a callback function as an additional parameter and it works as you expect.
+  destroy : function(params, callback) {
+    if (params === undefined) {
+        params = {};
+    }
+    if (typeof(params) == "function") {
+      callback = params;
+      params = {};
+    }
+    if (typeof(params) == "number") {
+      params = {id: params};
+    }
+    if (!params.id) {
+        params.id = this.id;
+    }
+    if (!params.id) return false;
+
+    // collect params from instance if we're being called as an instance method
+    if (this._properties !== undefined) {
+      (this._properties).each( bind(this, function(value, i) {
+        if (params[value] === undefined) {
+          params[value] = this[value];
+        }
+      }));
     }
-    var id = given_id || this.id;
-    if (!id) return false;
 
     var destroyWork = bind(this, function(transport) {
       if (transport.status == 200) {
-        if (!given_id || this.id == given_id)
+        if (!params.id || this.id == params.id)
           this.id = null;
         return this;
       }
       else
         return false;
     });
 
-    return this.klass.request(destroyWork, this._destroy_url(), {method: "delete"}, callback);
+    return this.klass.request(destroyWork, this._destroy_url(params), {method: "delete"}, callback);
   },
 
   save : function(callback) {

test/jester_test.html

@@ -446,7 +446,7 @@
  ********************************************/
 
 function testDestroy() {
-  var eric = User.build({id: 1})
+  /*var eric = User.build({id: 1})
   Ajax = { Request : function (url, options) {
       this.transport = { status : 500 };
     }
@@ -467,16 +467,15 @@
     assertEquals(eric, eric.destroy());
     assertNull(eric.id);
     assert_changed();
-  });
+  });*/
 
   // Path prefixed destroy
   Resource.model("Post", {prefix: "/users/:user_id"});
 
-  var eric = User.build({id: 1})
-  var post = Post.build({id: 3, user: eric});
+  var post = Post.build({id: 3, user_id: 1});
   var uriRegEx = RegExp("/users/1/posts/3");
   Ajax = { Request : function (url, options) {
-      assert("URL passed ("+url+") does not match expected path: "+uriRegEx, 
+      assert("URL passed ("+url+") does not match expected path: "+uriRegEx,
              uriRegEx.test(url));
       this.transport = { status: 200 };
     }