--description--

In the good old days, this was what you needed to do if you wanted to edit a document, and be able to use it somehow (e.g. sending it back in a server response). Mongoose has a dedicated updating method: Model.update(). It is bound to the low-level mongo driver. It can bulk-edit many documents matching certain criteria, but it doesn’t send back the updated document, only a 'status' message. Furthermore, it makes model validations difficult, because it just directly calls the mongo driver.

--instructions--

Modify the findEditThenSave function to find a person by _id (use any of the above methods) with the parameter personId as search key. Add "hamburger" to the list of the person's favoriteFoods (you can use Array.push()). Then - inside the find callback - save() the updated Person.

Note: This may be tricky, if in your Schema, you declared favoriteFoods as an Array, without specifying the type (i.e. [String]). In that case, favoriteFoods defaults to Mixed type, and you have to manually mark it as edited using document.markModified('edited-field'). See our <a href="https://www.freecodecamp.org/news/introduction-to-mongoose-for-mongodb-d2a7aa593c57/" target="_blank" rel="noopener noreferrer nofollow">Mongoose article</a>.

--hints--

Find-edit-update an item should succeed

  const response = await fetch(code + '/_api/find-edit-save', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      name: 'Poldo',
      age: 40,
      favoriteFoods: ['spaghetti']
    })
  });
  if (!response.ok) {
    throw new Error(await response.text());
  }
  const data = await response.json();
  assert.equal(data.name, 'Poldo', 'item.name is not what is expected');
  assert.equal(data.age, 40, 'item.age is not what expected');
  assert.deepEqual(
    data.favoriteFoods,
    ['spaghetti', 'hamburger'],
    'item.favoriteFoods is not what expected'
  );
  assert.equal(data.__v, 1, 'The item should be previously edited');