Recover usage of Todos counter cache

We’re being kept up to date the counter data but we’re not using it.
The only thing which is not real if is the number of projects that the 
user read changes the number of todos can be stale for some time.

The counters will be sync just after the user receives a new todo or mark any as done

1 files changed, 2 insertions, 4 deletions

diff --git a/lib/api/todos.rb b/lib/api/todos.rb
index a90a667fafe..19df13d8aac 100644
--- a/lib/api/todos.rb
+++ b/lib/api/todos.rb
@@ -61,9 +61,9 @@ module API
       #
       delete ':id' do
         todo = current_user.todos.find(params[:id])
-        todo.done
+        TodoService.new.mark_todos_as_done([todo], current_user)
 
-        present todo, with: Entities::Todo, current_user: current_user
+        present todo.reload, with: Entities::Todo, current_user: current_user
       end
 
       # Mark all todos as done
@@ -74,8 +74,6 @@ module API
       delete do
         todos = find_todos
         TodoService.new.mark_todos_as_done(todos, current_user)
-
-        todos.length
       end
     end
   end