--description--

When saving a document, MongoDB automatically adds the field _id, and set it to a unique alphanumeric key. Searching by _id is an extremely frequent operation, so Mongoose provides a dedicated method for it.

--instructions--

Modify the findPersonById to find the only person having a given _id, using Model.findById() -> Person. Use the function argument personId as the search key.

--hints--

Find an item by Id should succeed

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/find-by-id').then(
    (data) => {
      assert.equal(data.name, 'test', 'item.name is not what expected');
      assert.equal(data.age, 0, 'item.age is not what expected');
      assert.deepEqual(
        data.favoriteFoods,
        ['none'],
        'item.favoriteFoods is not what expected'
      );
      assert.equal(data.__v, 0, 'The item should be not previously edited');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );