Remove Discourse.transient. Use a singleton for session data, it's a lot cleaner.

app/assets/javascripts/discourse.js

@@ -10,9 +10,6 @@
 Discourse = Ember.Application.createWithMixins({
   rootElement: '#main',
 
-  // Data we want to remember for a short period
-  transient: Em.Object.create(),
-
   // Whether the app has focus or not
   hasFocus: true,
 
@@ -69,8 +66,7 @@ Discourse = Ember.Application.createWithMixins({
   }),
 
   titleChanged: function() {
-    var title;
-    title = "";
+    var title = "";
     if (this.get('title')) {
       title += "" + (this.get('title')) + " - ";
     }

app/assets/javascripts/discourse/mixins/load_more.js

@@ -31,7 +31,7 @@ Discourse.LoadMore = Em.Mixin.create(Discourse.Scrolling, {
     this.bindScrolling();
   },
 
-  willRemoveElement: function() {
+  willDestroyElement: function() {
     this._super();
     this.unbindScrolling();
   }

app/assets/javascripts/discourse/models/session.js

@@ -0,0 +1,35 @@
+/**
+  A data model representing current session data. You can put transient
+  data here you might want later.
+
+  @class Session
+  @extends Discourse.Model
+  @namespace Discourse
+  @module Discourse
+**/
+Discourse.Session = Discourse.Model.extend({});
+
+Discourse.Session.reopenClass({
+  /**
+    Returns the current session.
+
+    @method current
+    @returns {Discourse.Session} the current session singleton
+  **/
+  current: function(property, value) {
+    if (!this.currentSession) {
+      this.currentSession = Discourse.Session.create();
+    }
+
+    // If we found the current session
+    if (property) {
+      if (value) {
+        this.currentSession.set(property, value);
+      } else {
+        return this.currentSession.get(property);
+      }
+    }
+
+    return property ? this.currentSession.get(property) : this.currentSession;
+  }
+});

app/assets/javascripts/discourse/models/topic_list.js

@@ -45,7 +45,7 @@ Discourse.TopicList = Discourse.Model.extend({
           });
 
           topicList.set('more_topics_url', result.topic_list.more_topics_url);
-          Discourse.set('transient.topicsList', topicList);
+          Discourse.Session.current('topicList', topicList);
           topicList.set('loadingMore', false);
 
           return result.topic_list.more_topics_url;
@@ -60,8 +60,8 @@ Discourse.TopicList = Discourse.Model.extend({
 
   // loads topics with these ids "before" the current topics
   loadBefore: function(topic_ids){
-    var _this = this;
-    var topics = this.get('topics');
+    var topicList = this,
+        topics = this.get('topics');
 
     // refresh dupes
     topics.removeObjects(topics.filter(function(topic){
@@ -70,13 +70,12 @@ Discourse.TopicList = Discourse.Model.extend({
 
     Discourse.TopicList.loadTopics(topic_ids, this.get('filter'))
       .then(function(newTopics){
-        _this.forEachNew(newTopics, function(t) {
+        topicList.forEachNew(newTopics, function(t) {
           // highlight the first of the new topics so we can get a visual feedback
           t.set('highlight', true);
           topics.insertAt(0,t);
         });
-        Discourse.set('transient.topicsList', _this);
-
+        Discourse.Session.current('topicList', topicList);
       });
   }
 });
@@ -128,17 +127,17 @@ Discourse.TopicList.reopenClass({
   list: function(menuItem) {
     var filter = menuItem.get('name');
 
-    var list = Discourse.get('transient.topicsList');
+    var session = Discourse.Session.current();
+    var list = session.get('topicList');
     if (list) {
       if ((list.get('filter') === filter) && window.location.pathname.indexOf('more') > 0) {
         list.set('loaded', true);
-        return Ember.Deferred.promise(function(promise) {
-          promise.resolve(list);
-        });
+        return Ember.RSVP.resolve(list);
       }
     }
-    Discourse.set('transient.topicsList', null);
-    Discourse.set('transient.topicListScrollPos', null);
+
+    session.set('topicList', null);
+    session.set('topicListScrollPos', null);
 
     return Discourse.TopicList.find(filter, menuItem.get('excludeCategory'));
   }

app/assets/javascripts/discourse/routes/filtered_list_route.js

@@ -40,6 +40,14 @@ Discourse.FilteredListRoute = Discourse.Route.extend({
       listController.set('category', null);
       listController.set('canCreateTopic', topicList.get('can_create_topic'));
       listTopicsController.set('model', topicList);
+
+      var scrollPos = Discourse.Session.current('topicListScrollPosition');
+      if (scrollPos) {
+        Em.run.next(function() {
+          $('html, body').scrollTop(scrollPos);
+        });
+        Discourse.Session.current().set('topicListScrollPosition', null);
+      }
     });
   }
 });

app/assets/javascripts/discourse/routes/topic_route.js

@@ -71,9 +71,7 @@ Discourse.TopicRoute = Discourse.Route.extend({
     this._super();
 
     var topic = this.modelFor('topic');
-    Discourse.set('transient.lastTopicIdViewed', parseInt(topic.get('id'), 10));
-
-    // Set the search context
+    Discourse.Session.current('lastTopicIdViewed', parseInt(topic.get('id'), 10));
     this.controllerFor('search').set('searchContext', topic.get('searchContext'));
   },
 

app/assets/javascripts/discourse/routes/user_routes.js

@@ -162,7 +162,6 @@ Discourse.UserPrivateMessagesSentRoute = Discourse.UserActivityStreamRoute.exten
   userActionType: Discourse.UserAction.TYPES.messages_sent
 });
 
-//Discourse.UserTopicsListView = Em.View.extend({ templateName: 'user/topics_list' });
 Discourse.UserTopicListRoute = Discourse.Route.extend({
 
   renderTemplate: function() {

app/assets/javascripts/discourse/views/list/list_topics_view.js

@@ -22,16 +22,9 @@ Discourse.ListTopicsView = Discourse.View.extend(Discourse.LoadMore, {
 
   didInsertElement: function() {
     this._super();
-    var scrollPos = Discourse.get('transient.topicListScrollPos');
-    if (scrollPos) {
-      Em.run.schedule('afterRender', function() {
-        $('html, body').scrollTop(scrollPos);
-      });
-    } else {
-      Em.run.schedule('afterRender', function() {
-        $('html, body').scrollTop(0);
-      });
-    }
+    Em.run.schedule('afterRender', function() {
+      $('html, body').scrollTop(0);
+    });
   },
 
   hasTopics: Em.computed.gt('list.topics.length', 0),
@@ -46,7 +39,7 @@ Discourse.ListTopicsView = Discourse.View.extend(Discourse.LoadMore, {
     Discourse.notifyTitle(0);
     listTopicsView.get('controller').loadMore().then(function (hasMoreResults) {
       Em.run.schedule('afterRender', function() {
-        listTopicsView.saveScrollPos();
+        listTopicsView.saveScrollPosition();
       });
       if (!hasMoreResults) {
         listTopicsView.get('eyeline').flushRest();
@@ -55,14 +48,14 @@ Discourse.ListTopicsView = Discourse.View.extend(Discourse.LoadMore, {
   },
 
   // Remember where we were scrolled to
-  saveScrollPos: function() {
-    return Discourse.set('transient.topicListScrollPos', $(window).scrollTop());
+  saveScrollPosition: function() {
+    Discourse.Session.current('topicListScrollPosition', $(window).scrollTop());
   },
 
   // When the topic list is scrolled
   scrolled: function(e) {
     this._super();
-    this.saveScrollPos();
+    this.saveScrollPosition();
   }
 
 

app/assets/javascripts/discourse/views/list/topic_list_item_view.js

@@ -16,7 +16,7 @@ Discourse.TopicListItemView = Discourse.View.extend({
 
   init: function() {
     this._super();
-    return this.set('context', this.get('content'));
+    this.set('context', this.get('content'));
   },
 
   highlight: function() {
@@ -30,13 +30,14 @@ Discourse.TopicListItemView = Discourse.View.extend({
   },
 
   didInsertElement: function() {
-    // highligth the last topic viewed
-    if (Discourse.get('transient.lastTopicIdViewed') === this.get('content.id')) {
-      Discourse.set('transient.lastTopicIdViewed', null);
+    var session = Discourse.Session.current();
+
+    // // highligth the last topic viewed
+    if (session.get('lastTopicIdViewed') === this.get('content.id')) {
+      session.set('lastTopicIdViewed', null);
       this.highlight();
-    }
-    // highlight new topics that have been loaded from the server or the one we just created
-    else if (this.get('content.highlight')) {
+    } else if (this.get('content.highlight')) {
+      // highlight new topics that have been loaded from the server or the one we just created
       this.set('content.highlight', false);
       this.highlight();
     }

test/javascripts/models/session_test.js

@@ -0,0 +1,16 @@
+module("Discourse.Session");
+
+test('current', function(){
+  var session = Discourse.Session.current();
+
+  present(session, "We have a current site session");
+  equal(session, Discourse.Session.current(), "Calling it a second time returns the same instance");
+
+  blank(Discourse.Session.current('orange'), "by default properties are nil");
+  session.set('orange', 'newBlack');
+  equal(Discourse.Session.current('orange'), "newBlack", "it remembers values");
+
+  Discourse.Session.current('orange', 'juice');
+  equal(session.get('orange'), "juice", "it can be updated");
+
+});