您可以_id通过tournamentSessions使用自己的架构显式定义数组来禁用该字段，以便将其_id选项设置为false：
var Player = mongoose.model('Player', Schema({
createdAt: { type: Date, default: Date.Now },
lastActiveAt: Date,
clientVersion: String,
tournamentSessions: [new Schema({
tournament: { type: Schema.Types.ObjectId, ref: 'Tournament' },
level: Number,
status: String,
score: Number
}, { _id: false })],
friends: Array
}));
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