FIX: convert topic & post models to ember object.

assets/javascripts/discourse/components/knowledge-explorer-topic.js.es6

@@ -6,11 +6,20 @@ export default Ember.Component.extend({
 
   originalPostContent: reads("post.cooked"),
 
-  post: reads("topic.post_stream.posts.firstObject"),
+  post: computed("topic", function() {
+    return this.store.createRecord(
+      "post",
+      this.topic.post_stream.posts.firstObject
+    );
+  }),
 
   model: computed("post", "topic", function() {
     const post = this.post;
-    post.topic = this.topic;
+
+    if (!post.topic) {
+      post.set("topic", this.topic);
+    }
+
     return post;
   }),
 

assets/javascripts/discourse/controllers/knowledge-explorer.js.es6

@@ -1,5 +1,6 @@
 import discourseComputed from "discourse-common/utils/decorators";
 import Category from "discourse/models/category";
+import Topic from "discourse/models/topic";
 import { on } from "discourse-common/utils/decorators";
 import KnowledgeExplorer from "discourse/plugins/discourse-knowledge-explorer/discourse/models/knowledge-explorer";
 
@@ -87,7 +88,7 @@ export default Ember.Controller.extend({
 
       KnowledgeExplorer.getTopic(topicId).then(result => {
         this.setProperties({
-          topic: result,
+          topic: Topic.create(result),
           isTopicLoading: false
         });
       });

assets/javascripts/discourse/models/knowledge-explorer.js.es6

@@ -1,4 +1,5 @@
 import { ajax } from "discourse/lib/ajax";
+import Topic from "discourse/models/topic";
 
 function getTopic(id) {
   return ajax(`/t/${id}.json`);
@@ -20,7 +21,7 @@ export default {
     if (params.selectedTopic) {
       promise = promise.then(data => {
         return getTopic(params.selectedTopic).then(topic => {
-          data.topic = topic;
+          data.topic = Topic.create(topic);
           return data;
         });
       });