[feature] add search on forum (#1572)

- add simple form for search
- update of Index action to search the forum if search query present.

Co-authored-by: amu1996 <thisamu4u@gmail.com>

app/controllers/simple_discussion/forum_threads_controller.rb

@@ -8,7 +8,19 @@ class SimpleDiscussion::ForumThreadsController < SimpleDiscussion::ApplicationCo
   after_action :broadcast_to_mods, only: [:create]
 
   def index
-    @forum_threads = ForumThread.pinned_first.sorted.includes(:user, :forum_category).paginate(page: page_number)
+    @forum_threads = ForumThread.pinned_first.sorted
+                                .includes(:user, :forum_category)
+                                .paginate(page: page_number)
+
+    if params[:search].present?
+      search_query = "%#{params[:search].downcase}%"
+
+      @forum_threads = @forum_threads.joins(forum_posts: :rich_text_body)
+                                    .where("LOWER(forum_threads.title) LIKE ? OR LOWER(action_text_rich_texts.body) LIKE ?", search_query, search_query)
+                                    .distinct
+    end
+
+    render "simple_discussion/forum_threads/index"
   end
 
   def answered

app/views/layouts/simple_discussion.html.erb

@@ -98,11 +98,15 @@
   <div class="col-md-9 mb-3">
 
     <div class="card card-body">
+      <%= form_tag simple_discussion.forum_threads_path, method: :get do %>
+        <%= text_field_tag :search, params[:search], placeholder: "Search threads..." %>
+        <%= submit_tag "Search" %>
+      <% end %>
       <%= yield %>
     </div>
 
   </div>
 </div>
 
 <% parent_layout("forum") %>
-<%= cms_snippet_render('footer').html_safe unless mobile? %>
+<%= cms_snippet_render('footer').html_safe unless mobile? %>