Step 13

Let's include a route to update a note.

Similar to how we updated NoteDao.create to provide input validation, we must update NoteDao.update method:

update(id, content, author) {
  if (!content || !author) {
    throw new Error("Invalid attributes");
  }
  
  const index = this.notes.findIndex((note) => note._id === id);
  if (index !== -1) {
    this.notes[index].content = content;
    this.notes[index].author = author;
    return this.notes[index];
  }
  return null;
}

Add the following route to index.js:

app.put("/api/notes/:id", (req, res) => {
  const id = Number.parseInt(req.params.id);
  const content = req.body.content;
  const author = req.body.author;

  try {
    const note = notes.update(id, content, author);
    if (note) {
      res.json(note);
    } else {
      res.status(404).send("Resource not found!");
    }
  } catch (error) {
    res.status(400).send(error.message);
  }
});

Notice I set two error status code: (400) for invalid request and (404) for invalid ID number (resource not found).

In Postman, test this endpoint by attempting to update a note that exist.

Also, test by requesting to update a note that does not exist.

Finally, test the endpoint with insufficient or invalid attributes.