Javascript Mongoose-如何确定查询中是否已经存在嵌套对象？

我的数据库存储一个

用户

，该用户有一个

watchMovies[]

数组，其中包含一个嵌套对象

movie

当接收到包含

watchedMovie

对象的更新/放置API请求时，我想检查

id=zzz的
movie
是否已经存在于
watchedMovie[]
数组中

问题是，这个查询不能做到这一点。我做错了什么

User.find(
  { username: req.params.username, 'watchedMovies.movie.id': movie.id },
  function (err, count) { 
    if (!err) exist = true;
  }
);  

完整代码如下：
模式

var userSchema = new Schema({
    username: { type: String, require: true },
    firstName: String,
    lastName: String,
    ...
    watchedMovies : [{ 
        movie: { type: Schema.Types.ObjectId, ref: 'Movie' },
        time: Date,
        watchedDuration: Number,
    }],
})

JSON请求正文

{
    "id": "10-things-i-hate-about-you", //movie id
    "time": "2012-05-29T17:57:30.169Z",
    "watchedDuration": "88"
}

router.put('/:username/watchedMovies', function (req, res, next) {

  //find movie
  Movie.findOne({ id: req.body.id }, function (err, movie) {

    if (err) res.send(err);

    //find if user already has the movie in the watchedMovies list
    var exist = false;
    User.find(
      { username: req.params.username, 'watchedMovies.movie.id': movie.id },
      function (err, count) { 
        if (!err) exist = true;
      }
    );   

    //if movie is already in watchedList, update User with it
    if (exist) {
      //set existing watchedMovie object
      User.update(...$set...)
    } else { // push new
      User.findOneAndUpdate(...$push...) 
    }

  });

});

猫鼬查询

{
    "id": "10-things-i-hate-about-you", //movie id
    "time": "2012-05-29T17:57:30.169Z",
    "watchedDuration": "88"
}

router.put('/:username/watchedMovies', function (req, res, next) {

  //find movie
  Movie.findOne({ id: req.body.id }, function (err, movie) {

    if (err) res.send(err);

    //find if user already has the movie in the watchedMovies list
    var exist = false;
    User.find(
      { username: req.params.username, 'watchedMovies.movie.id': movie.id },
      function (err, count) { 
        if (!err) exist = true;
      }
    );   

    //if movie is already in watchedList, update User with it
    if (exist) {
      //set existing watchedMovie object
      User.update(...$set...)
    } else { // push new
      User.findOneAndUpdate(...$push...) 
    }

  });

});

我认为这是个问题，这是你的模型

var userSchema = new Schema({
    username: { type: String, require: true },
    firstName: String,
    lastName: String,
    ...
    watchedMovies : [{ 
        movie: { type: Schema.Types.ObjectId, ref: 'Movie' },
        time: Date,
        watchedDuration: Number,
    }],
})

但你的问题是

{ username: req.params.username, 'watchedMovies.movie.id': movie.id }

不要使用电影id

试试这个

{ username: req.params.username, 'watchedMovies.movie': movie.id }

我认为这是个问题，这是你的模型

var userSchema = new Schema({
    username: { type: String, require: true },
    firstName: String,
    lastName: String,
    ...
    watchedMovies : [{ 
        movie: { type: Schema.Types.ObjectId, ref: 'Movie' },
        time: Date,
        watchedDuration: Number,
    }],
})

但你的问题是

{ username: req.params.username, 'watchedMovies.movie.id': movie.id }

不要使用电影id

试试这个

{ username: req.params.username, 'watchedMovies.movie': movie.id }

是的，这很有效！with
movie.\u id
with是参考id。是的，这有效！with
movie.\u id
with是参考id。