FEATURE: each category can control how many topics to show on categories page

app/assets/javascripts/discourse/models/category.js.es6

@@ -70,7 +70,7 @@ const Category = RestModel.extend({
 
   @computed("topic_count")
   moreTopics(topicCount) {
-    return topicCount > Discourse.SiteSettings.category_featured_topics;
+    return topicCount > (this.get('num_featured_topics') || 2);
   },
 
   save() {
@@ -103,7 +103,8 @@ const Category = RestModel.extend({
         sort_order: this.get('sort_order'),
         sort_ascending: this.get('sort_ascending'),
         topic_featured_link_allowed: this.get('topic_featured_link_allowed'),
-        show_subcategory_list: this.get('show_subcategory_list')
+        show_subcategory_list: this.get('show_subcategory_list'),
+        num_featured_topics: this.get('num_featured_topics')
       },
       type: id ? 'PUT' : 'POST'
     });
@@ -149,7 +150,7 @@ const Category = RestModel.extend({
   @computed("topics")
   featuredTopics(topics) {
     if (topics && topics.length) {
-      return topics.slice(0, Discourse.SiteSettings.category_featured_topics || 2);
+      return topics.slice(0, this.get('num_featured_topics') || 2);
     }
   },
 

app/assets/javascripts/discourse/templates/components/edit-category-settings.hbs

@@ -75,8 +75,17 @@
   {{plugin-outlet name="category-email-in" args=(hash category=category)}}
 {{/if}}
 
+{{#unless category.parent_category_id}}
+  <section class="field num-featured-topics-fields">
+    <label>
+      {{i18n "category.num_featured_topics"}}
+      {{text-field value=category.num_featured_topics}}
+    </label>
+  </section>
+{{/unless}}
+
 {{#if showPositionInput}}
-  <section class='field'>
+  <section class='field position-fields'>
     <label>
       {{i18n 'category.position'}}
       {{text-field value=category.position class="position-input"}}