FIX: Was modifying Category after it was instantiated

assets/javascripts/discourse/initializers/extend-for-solved-button.js.es6

@@ -11,25 +11,7 @@ export default {
   name: 'extend-for-solved-button',
   initialize: function() {
 
-    Discourse.Category.reopen({
-
-      @computed("custom_fields")
-      enable_accepted_answers: {
-        get() {
-          const fields = this.get("custom_fields");
-          return fields && fields.enable_accepted_answers === "true";
-        },
-        set(value) {
-          value = value ? "true" : "false";
-          this.set("custom_fields.enable_accepted_answers", value);
-          return value;
-        }
-      }
-
-    });
-
     Topic.reopen({
-
       // keeping this here cause there is complex localization
       acceptedAnswerHtml: function(){
         const username = this.get('accepted_answer.username');

assets/javascripts/discourse/pre-initializers/extend-category-for-solved.js.es6

@@ -0,0 +1,25 @@
+import property from 'ember-addons/ember-computed-decorators';
+import Category from 'discourse/models/category';
+
+export default {
+  name: 'extend-category-for-solved',
+  before: 'inject-discourse-objects',
+  initialize() {
+
+    Category.reopen({
+
+      @property('custom_fields.enable_accepted_answers')
+      enable_accepted_answers: {
+        get(enableField) {
+          return enableField === "true";
+        },
+        set(value) {
+          value = value ? "true" : "false";
+          this.set("custom_fields.enable_accepted_answers", value);
+          return value;
+        }
+      }
+
+    });
+  }
+};