In this exercise, we're going to write routes for updating a todo title or a todo item, and here we will introduce a new Knex method, .update():

1. Let's start by modifying our previous PATCH: /todo/<id> route. We have also added an extra validation to make sure that title is supplied as payload:

{
  method: 'PATCH',
  path: '/todo/{id}',
  ...
    title: Joi.string().required(),
    }
  }
  }
},

2. Let's test the route:

3. Now, let's add another PATCH route for /todo/<id>/item, this will help in editing a todo item's text and also marking a todo item as done or not done:

{
  method: 'PATCH',
  path: '/todo/{todo_id}/item/{id}',
  handler: async (request, reply) => 
  {
    const itemId = request.params.id;
    ...
    payload: 
    {
      text: Joi.string(),
      done: Joi.boolean(),
    }
  ...
},

4. This route can take each of the payload items one at a time (which will be the most practical case, when using, for example, a web or mobile UI), or all at once:
   1. For instance, changing the item from Nairobi to Nigeria, or:

1. 2. Marking the item as done:

5. When we list the items again through the GET: /todo/<id>/item route, you will see the updated item: