我是 mongoose 的新手，我正在尝试编写一个只返回我的主文档中的子文档的查询。

我的文档结构是这样的:

PROFILE
    - CONTACTS [ARRAY]

我编写了以下端点来返回一个联系人，我在其中传递了个人资料 ID 和子文档的 ID:

"/:owerId/getcontact/:contactId"

我的 Express 函数代码如下所示:

router.route('/:ownerId/getcontact/:contactId')

    .get(function(req, res){
      Profile.findOne({'owner_id':req.params.ownerId}).then(function(err, profile){
        if(err)
          res.send(err);

        profile.findOne({'_id':req.params.contactId}).then(function(err, contact){
          if(err)
            res.send(err);
          res.json(contact);
        })

      })
    })

但此代码返回整个配置文件。

当我尝试通过 ID 获取时，它会做同样的事情。这是我的代码，下面是返回的整个配置文件:

router.route('/:ownerId/getcontact/:contactId')

.get(function(req, res){
  Profile.findById(req.params.ownerId).then(function(err, profile){
    if(err)
      res.send(err);

      var data = profile.contacts.id(req.params.contactId);

    res.json(data);

  })
})





{
  "_id": "5886e3692ca4542c453431ee",
  "initial": "u",
  "last_name": "randal",
  "first_name": "chris",
  "owner_id": "5886e32c2ca4542c453431ed",
  "__v": 1,
  "contacts": [
    {
      "last_name": "Eltoro",
      "first_name": "Peter",
      "_id": "5886e3f5a219472cac886a9f",
      "businesses": [],
      "addresses": [],
      "phones": [
        {
          "phone_type": "mobile",
          "phone_number": "555-555-999",
          "_id": "5886e3f5a219472cac886aa2"
        },
        {
          "phone_type": "home",
          "phone_number": "999-876-000",
          "_id": "5886e3f5a219472cac886aa1"
        }
      ],
      "emails": [
        {
          "email_address": "tim@time.com",
          "_id": "5886e3f5a219472cac886aa0"
        }
      ]
    },
    {
      "college": "University of WA",
      "highschool": "Kalaheo",
      "birthday": "1990-12-22T08:00:00.000Z",
      "last_name": "Smith",
      "first_name": "Suzanne",
      "_id": "5886fb7fac288c2e31eabe0a",
      "businesses": [],
      "addresses": [
        {
          "zip": "98777",
          "state": "WA",
          "city": "Seattle",
          "address_2": "Apt 234",
          "address": "124 194th St. SW",
          "_id": "5886fb7fac288c2e31eabe0e"
        }
      ],
      "phones": [
        {
          "phone_type": "mobile",
          "phone_number": "206-899-9898",
          "_id": "5886fb7fac288c2e31eabe0d"
        },
        {
          "phone_type": "home",
          "phone_number": "206-789-0987",
          "_id": "5886fb7fac288c2e31eabe0c"
        }
      ],
      "emails": [
        {
          "email_type": "personal",
          "email_address": "suzanne@smith.com",
          "_id": "5886fb7fac288c2e31eabe0b"
        }
      ]
    },
    {
      "last_name": "Alabaster",
      "first_name": "Cindy",
      "_id": "5888b0bd3c025e54476828d9",
      "businesses": [],
      "addresses": [],
      "phones": [
        {
          "phone_type": "home",
          "phone_number": "999-999-0909",
          "_id": "5888b0bd3c025e54476828dc"
        },
        {
          "phone_type": "home",
          "phone_number": "000-000-0000",
          "_id": "5888b0bd3c025e54476828db"
        }
      ],
      "emails": [
        {
          "email_address": "Some@them.com",
          "_id": "5888b0bd3c025e54476828da"
        }
      ]
    }
  ],
  "businesses": [],
  "addresses": [],
  "phones": [
    {
      "phone_number": "999-999-9999",
      "phone_type": "mobile",
      "_id": "5886e37f2ca4542c453431ef"
    }
  ],
  "emails": []
}

最佳答案

Mongoose 子文档有特殊的方法来检索它们:

router
  .route('/:ownerId/getcontact/:contactId')
    .get(function(req, res) {
      Profile.findOne({ owner_id: req.params.ownerId }, function(err, profile) {
        if ( err ) {
          res.send(err);
        }
        var contact = profile.contacts.id(req.params.contactId);
        res.json(contact);
      });
    });

参见 Mongoose Sub Documents .

关于node.js - 查询显示子文档不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41852904/