Mongoose：在两个单独的数组中使用相同的模式

I have two schemas, defined as following:

我有两个模式，定义如下：

var userSchema = new Schema({
 email: String,
 name: String,
 role: String,
 password: String
})

var raceSchema = new Schema({
 date: Date,
 name: String,
 location: String,
 time: String,
 register: String,
 participants: [{ type: Schema.Types.ObjectId, ref: 'User'}],
 registered_participants: [{ type: Schema.Types.ObjectId, ref: 'User'}],
})

As you can see, I reference the first schema twice in the second schema. If I add a reference to a user in one of the lists, everything is fine. But when I add a reference to the same user to the other list I get the following error: Cast to [undefined] failed for value

如您所见，我在第二个模式中引用了第一个模式两次。如果我在其中一个列表中添加对用户的引用，一切都很好。但是当我将同一用户的引用添加到另一个列表时，我收到以下错误：转换为[undefined]失败的值

What causes this error? Is it related to the fact that the same schema is used twice in the second schema?

是什么导致这个错误？是否与在第二个模式中使用相同模式两次的事实有关？

Edit: I get the error when I call the following Express endpoint:

编辑：当我调用以下Express端点时出现错误：

app.post('/race/:id/registered', passport.authenticate('jwt', { session: false}), (req, res) =>
  Race.findOne({ _id: req.params.id }, function (err, race) {
    if (err) return res.json({'Error': err})
    if (!race) return res.json({'Error': 'Race not found'})
    race.registered_participants.push(req.user)
    race.save(function (err, updatedRace) {
      if (err) return res.json({'Error': err})
      res.send(updatedRace)
    })
  })
)

Edit 2: The model definitions:

编辑2：模型定义：

var User = mongoose.model('User', userSchema);
var Race = mongoose.model('Race', raceSchema);

1 个解决方案

#1

Try using findByIdAndUpdate in your POST method instead:

请尝试在POST方法中使用findByIdAndUpdate：

app.post('/race/:id/registered', passport.authenticate('jwt', { session: false}), (req, res) =>
  Race.findByIdAndUpdate(req.params.id,
  { $push: { registered_participants: req.user } }, 
   function (err, race) {
      if (err) return res.json({'Error': err})
      res.send(race)
    })
)