猫鼬中的“ __v”字段是什么

好吧，我看不到Tony的解决方案...所以我必须自己解决...

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如果您不需要version_key，则可以：

var UserSchema = new mongoose.Schema({
    nickname: String,
    reg_time: {type: Date, default: Date.now}
}, {
    versionKey: false // You should be aware of the outcome after set to false
});