Feat: custom sort (#4864)

app/models/concerns/sort_handler.rb

@@ -0,0 +1,25 @@
+module SortHandler
+  extend ActiveSupport::Concern
+
+  included do
+    def self.latest
+      order(last_activity_at: :desc)
+    end
+
+    def self.sort_on_created_at
+      order(created_at: :asc)
+    end
+
+    def self.last_messaged_conversations
+      Message.except(:order).select('DISTINCT ON (conversation_id) *').order('conversation_id, created_at DESC')
+    end
+
+    def self.sort_on_last_user_message_at
+      where(
+        'grouped_conversations.message_type = 0'
+      ).order(
+        'grouped_conversations.created_at ASC'
+      )
+    end
+  end
+end