diff -r 7722ec70c01b -r f5297dde9053 client/js/model.js
--- a/client/js/model.js	Fri Jul 27 12:22:10 2012 +0200
+++ b/client/js/model.js	Fri Jul 27 19:15:32 2012 +0200
@@ -3,35 +3,30 @@
 Rkns.Model._BaseElement = function(_project, _props) {
     if (typeof _props !== "undefined") {
         this._project = _project;
-        this.id = _props.id || Rkns.utils.getUID(this.type);
+        this.id = _props.id || Rkns.Utils.getUID(this.type);
         this.title = _props.title || "(untitled " + this.type + ")";
         this.description = _props.description || "";
         this.uri = _props.uri || "";
     }
 }
 
-Rkns.Model._BaseElement.prototype.addReference = function(_propName, _list, _id) {
-    this[ _propName + "_id" ] = _id;
+Rkns.Model._BaseElement.prototype.addReference = function(_propName, _list, _id, _default) {
     var _element = _list.getElement(_id);
-    this[ _propName ] = _element;
+    if (typeof _element === "undefined" && typeof _default !== "undefined") {
+        this[ _propName ] = _default;
+        this[ _propName + "_id" ] = _default.id;
+    } else {
+        this[ _propName + "_id" ] = _id;
+        this[ _propName ] = _element;
+    }
 }
 
 Rkns.Model._BaseElement.prototype.updateGraphics = function() {
-    this._project._renderer.redraw();
+    this._project.renderer.redraw();
 }
 
 Rkns.Model._BaseElement.prototype.updateData = function() {
-}
-
-Rkns.Model._BaseElement.prototype.propagateChanges = function(_from) {
-    switch(_from) {
-        case Rkns._FROM_GRAPHICS:
-            this.updateData();
-        break;
-        case Rkns._FROM_DATA:
-            this.updateGraphics();
-        break;
-    }
+    this._project.serializer.save(this);
 }
 
 /* Element Class Generator */
@@ -55,11 +50,11 @@
 Rkns.Model.Node = Rkns.Model._elementClass("node");
 
 Rkns.Model.Node.prototype._init = function(_project, _props) {
-    this.addReference("created_by", this._project.users, _props.created_by);
+    this.addReference("created_by", this._project.users, _props.created_by, _project.current_user);
     this.position = _props.position;
 }
 
-Rkns.Model.Node.prototype.setPosition = function(_from, _x, _y) {
+Rkns.Model.Node.prototype.setPosition = function(_x, _y) {
     if (typeof _x === "object") {
         if (typeof _x.x !== "undefined" && typeof _x.y !== "undefined") {
             this.position.x = _x.x;
@@ -76,7 +71,6 @@
             this.position.y = +_y;
         }
     }
-    this.propagateChanges(_from);
 }
 
 /* Edge Model */
@@ -84,7 +78,7 @@
 Rkns.Model.Edge = Rkns.Model._elementClass("edge");
 
 Rkns.Model.Edge.prototype._init = function(_project, _props) {
-    this.addReference("created_by", this._project.users, _props.created_by);
+    this.addReference("created_by", this._project.users, _props.created_by, _project.current_user);
     this.addReference("from", this._project.nodes, _props.from);
     this.addReference("to", this._project.nodes, _props.to);
 }