Merge branch 'grapify-todos-api' into 'master'

Grapify todos API

## What does this MR do?

Add the Grape-DSL to the todos API.

## What are the relevant issue numbers?

Related to #22928

See merge request !6875

lib/api/todos.rb

@@ -8,18 +8,19 @@ module API
       'issues' => ->(id) { find_project_issue(id) }
     }
 
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
     resource :projects do
       ISSUABLE_TYPES.each do |type, finder|
         type_id_str = "#{type.singularize}_id".to_sym
 
-        # Create a todo on an issuable
-        #
-        # Parameters:
-        #   id (required) - The ID of a project
-        #   issuable_id (required) - The ID of an issuable
-        # Example Request:
-        #   POST /projects/:id/issues/:issuable_id/todo
-        #   POST /projects/:id/merge_requests/:issuable_id/todo
+        desc 'Create a todo on an issuable' do
+          success Entities::Todo
+        end
+        params do
+          requires type_id_str, type: Integer, desc: 'The ID of an issuable'
+        end
         post ":id/#{type}/:#{type_id_str}/todo" do
           issuable = instance_exec(params[type_id_str], &finder)
           todo = TodoService.new.mark_todo(issuable, current_user).first
@@ -40,25 +41,21 @@ module API
         end
       end
 
-      # Get a todo list
-      #
-      # Example Request:
-      #  GET /todos
-      #
+      desc 'Get a todo list' do
+        success Entities::Todo
+      end
       get do
         todos = find_todos
 
         present paginate(todos), with: Entities::Todo, current_user: current_user
       end
 
-      # Mark a todo as done
-      #
-      # Parameters:
-      #   id: (required) - The ID of the todo being marked as done
-      #
-      # Example Request:
-      #  DELETE /todos/:id
-      #
+      desc 'Mark a todo as done' do
+        success Entities::Todo
+      end
+      params do
+        requires :id, type: Integer, desc: 'The ID of the todo being marked as done'
+      end
       delete ':id' do
         todo = current_user.todos.find(params[:id])
         TodoService.new.mark_todos_as_done([todo], current_user)
@@ -66,11 +63,7 @@ module API
         present todo.reload, with: Entities::Todo, current_user: current_user
       end
 
-      # Mark all todos as done
-      #
-      # Example Request:
-      #  DELETE /todos
-      #
+      desc 'Mark all todos as done'
       delete do
         todos = find_todos
         TodoService.new.mark_todos_as_done(todos, current_user)