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我想从mongo中找到一个文档,但是findOne()将带有一个未定义的_id字段的文档。 为什么?猫鼬不检索_id
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/school');
var Schema = mongoose.Schema;
var scoreSchema = new Schema({
type: String,
score: Number
});
var studentSchema = new Schema({
name: String,
scores: [scoreSchema]
});
var mod = mongoose.model('Student', studentSchema);
mod.findOne(function(err, stud) {
console.log('id:' + stud._id);
});