freeCodeCamp/curriculum/challenges/chinese/05-apis-and-microservices/mongodb-and-mongoose/use-model.findbyid-to-search-your-database-by-id.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
587d7fb7367417b2b2512c0d	使用 model.findById() 方法，根据 _id 来搜索数据	2	301544	use-model-findbyid-to-search-your-database-by-id

--description--

在保存 document 的时候，MongoDB 会自动为它添加 _id 字段，并给该字段设置一个唯一的仅包含数字和字母的值。通过 _id 搜索是一个十分常见的操作，为此，Mongoose 提供了一个专门的方法。

--instructions--

执行Model.findById() -> Person，使用 personId 作为搜索参数，根据 _id 找到对应的（唯一的）person。

--hints--

应成功地根据 Id 找到对应的数据

(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);
    }
  );

--solutions--

/**
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*/