FEATURE: site setting to enable solved globally

assets/javascripts/discourse/connectors/category-custom-settings/solved-settings.hbs

@@ -1,3 +1,4 @@
+{{#unless siteSettings.allow_solved_on_all_topics}}
 <section class='field'>
   <div class="enable-accepted-answer">
     <label class="checkbox-label">
@@ -6,3 +7,4 @@
     </label>
   </div>
 </section>
+{{/unless}}

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

@@ -3,7 +3,7 @@ import PostView from 'discourse/views/post';
 import { Button } from 'discourse/views/post-menu';
 import Topic from 'discourse/models/topic';
 import User from 'discourse/models/user';
-import TopicStatus from 'discourse/views/topic-status'
+import TopicStatus from 'discourse/views/topic-status';
 
 export default {
   name: 'extend-for-solved-button',
@@ -17,7 +17,7 @@ export default {
         var fields = this.get('custom_fields');
         return fields && (fields.enable_accepted_answers === "true");
       }.property('custom_fields')
-    }),
+    });
 
     Topic.reopen({
 

config/locales/server.en.yml

@@ -0,0 +1,3 @@
+en:
+  site_settings:
+    allow_solved_on_all_topics: "Allow users to select solutions on all topics (by default you control this by editing categories)"

config/settings.yml

@@ -0,0 +1,4 @@
+plugins:
+  allow_solved_on_all_topics:
+    default: false
+    client: true

plugin.rb

@@ -138,6 +138,8 @@ after_initialize do
     end
 
     def allow_accepted_answers_on_category?(category_id)
+      return true if SiteSetting.allow_solved_on_all_topics
+
       self.class.reset_accepted_answer_cache unless @@allowed_accepted_cache["allowed"]
       @@allowed_accepted_cache["allowed"].include?(category_id)
     end
@@ -157,6 +159,7 @@ after_initialize do
 
     def can_accept_answer
       topic = (topic_view && topic_view.topic) || object.topic
+
       if topic
         scope.can_accept_answer?(topic) &&
         object.post_number > 1 && !accepted_answer