Use cache for todos counter calling TodoService

CHANGELOG

@@ -270,6 +270,7 @@ v 8.10.0
   - Fix new snippet style bug (elliotec)
   - Instrument Rinku usage
   - Be explicit to define merge request discussion variables
+  - Use cache for todos counter calling TodoService
   - Metrics for Rouge::Plugins::Redcarpet and Rouge::Formatters::HTMLGitlab
   - RailsCache metris now includes fetch_hit/fetch_miss and read_hit/read_miss info.
   - Allow [ci skip] to be in any case and allow [skip ci]. !4785 (simon_w)

app/models/user.rb

@@ -809,13 +809,13 @@ class User < ActiveRecord::Base
 
   def todos_done_count(force: false)
     Rails.cache.fetch(['users', id, 'todos_done_count'], force: force) do
-      todos.done.count
+      TodosFinder.new(self, state: :done).execute.count
     end
   end
 
   def todos_pending_count(force: false)
     Rails.cache.fetch(['users', id, 'todos_pending_count'], force: force) do
-      todos.pending.count
+      TodosFinder.new(self, state: :pending).execute.count
     end
   end
 

lib/api/todos.rb

@@ -73,7 +73,7 @@ module API
       #
       delete do
         todos = find_todos
-        todos.each(&:done)
+        TodoService.new.mark_todos_as_done(todos, current_user)
 
         todos.length
       end

spec/requests/api/todos_spec.rb

@@ -117,6 +117,12 @@ describe API::Todos, api: true do
         expect(response.status).to eq(200)
         expect(pending_1.reload).to be_done
       end
+
+      it 'updates todos cache' do
+        expect_any_instance_of(User).to receive(:update_todos_count_cache).and_call_original
+
+        delete api("/todos/#{pending_1.id}", john_doe)
+      end
     end
   end
 
@@ -139,6 +145,12 @@ describe API::Todos, api: true do
         expect(pending_2.reload).to be_done
         expect(pending_3.reload).to be_done
       end
+
+      it 'updates todos cache' do
+        expect_any_instance_of(User).to receive(:update_todos_count_cache).and_call_original
+
+        delete api("/todos", john_doe)
+      end
     end
   end