javascript - 两个重复的 ID 字段(_id 和 id)自动填充

Question

从我的数据库中获取数据时，我注意到除了正常的 _id 字段之外还有一个额外的 id 字段。这 2 个字段始终完全相同。但是，id 和 _id 仅在我填充时出现。否则只有 _id 字段。这是架构 -

const answerSchema = new mongoose.Schema({
    content: {
        type: String,
        required: [true, 'An answer must have a summary'],
    },
    user: {
        type: mongoose.Types.ObjectId,
        required: [true, 'An answer must have a user'],
    },
    post: {
        type: mongoose.Types.ObjectId,
        required: [true, 'An answer must belong to a post'],
        ref: 'Post',
    },
    users: [{ type: mongoose.Types.ObjectId, ref: 'User' }],
    isCorrect: {
        type: Boolean,
        default: false,
    },
});

answerSchema.pre(/^find/, function (next) {
    this.populate({
        path: 'post',
        select: '-answers -users',
    }).populate('user');
    next();
});

const Answer = mongoose.model('Answer', answerSchema);

为什么会发生这种情况，我该如何解决？

Answer 1

基于 mongoose ref 您可以使用以下代码禁用传递 id 到文档:

new Schema({ name: String }, { id: false });