FIX: enabling suppress_from_homepage should only remove the category from the homepage

app/controllers/list_controller.rb

@@ -54,15 +54,17 @@ class ListController < ApplicationController
       list_opts.merge!(options) if options
       user = list_target_user
 
-      if filter == :latest && params[:category].blank?
-        list_opts[:no_definitions] = true
-      end
-
-      if filter.to_s == current_homepage
-        list_opts.merge!(exclude_category_ids: get_excluded_category_ids(list_opts[:category]))
+      if params[:category].blank?
+        if filter == :latest
+          list_opts[:no_definitions] = true
+        end
+        if filter.to_s == current_homepage
+          list_opts[:exclude_category_ids] = get_excluded_category_ids(list_opts[:category])
+        end
       end
 
       list = TopicQuery.new(user, list_opts).public_send("list_#{filter}")
+
       list.more_topics_url = construct_url_with(:next, list_opts)
       list.prev_topics_url = construct_url_with(:prev, list_opts)
       if Discourse.anonymous_filters.include?(filter)
@@ -165,7 +167,7 @@ class ListController < ApplicationController
       top_options[:per_page] = SiteSetting.topics_per_period_in_top_page
 
       if "top".freeze == current_homepage
-        top_options.merge!(exclude_category_ids: get_excluded_category_ids(top_options[:category]))
+        top_options[:exclude_category_ids] = get_excluded_category_ids(top_options[:category])
       end
 
       user = list_target_user

spec/controllers/list_controller_spec.rb

@@ -248,4 +248,30 @@ describe ListController do
 
   end
 
+  describe "categories suppression" do
+    let(:category_one) { Fabricate(:category) }
+    let(:sub_category) { Fabricate(:category, parent_category: category_one, suppress_from_homepage: true) }
+    let!(:topic_in_sub_category) { Fabricate(:topic, category: sub_category) }
+
+    let(:category_two) { Fabricate(:category, suppress_from_homepage: true) }
+    let!(:topic_in_category_two) { Fabricate(:topic, category: category_two) }
+
+    it "suppresses categories from the homepage" do
+      get SiteSetting.homepage, format: :json
+      expect(response).to be_success
+
+      topic_titles = JSON.parse(response.body)["topic_list"]["topics"].map { |t| t["title"] }
+      expect(topic_titles).not_to include(topic_in_sub_category.title, topic_in_category_two.title)
+    end
+
+    it "does not suppress" do
+      get SiteSetting.homepage, category: category_one.id, format: :json
+      expect(response).to be_success
+
+      topic_titles = JSON.parse(response.body)["topic_list"]["topics"].map { |t| t["title"] }
+      expect(topic_titles).to include(topic_in_sub_category.title)
+    end
+
+  end
+
 end