Add message threads #394

This new view sorts the messages by threads based on the reply_to.
Now we store only the message which started a new thread in the reply_to
field to avoid recursive queries.

plugins/messages/config/routes.rb

@@ -1,5 +1,20 @@
 Rails.application.routes.draw do
   scope '/:foodcoop' do
     resources :messages, :only => [:index, :show, :new, :create]
+
+    resources :message_threads, :only => [:index, :show]
+
+    resources :messagegroups, only: [:index] do
+      member do
+        post :join
+        post :leave
+      end
+    end
+
+    namespace :admin do
+      resources :messagegroups do
+        get :memberships, on: :member
+      end
+    end
   end
 end