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MongooseError：无法填充路径，loaned_to因为它不在您的架构中。将选项设置strictPopulate为 false 以覆盖。

我尝试在nodejs中使用mongoose连接mongodb中的两个文档，但不幸的是发生了这个错误。我的猫鼬版本是6.0.6

图书架构

const mongoose = require('mongoose');

const BookSchema = new mongoose.Schema({
    "name": {type: String, required: true},
    "author_name": {type: String, required: true},
    "published_date": {type: Date, required: false},
    "copies": [
        {
            "isbn_number": {type: String, required: true},
            "status": {type: String, required: true, default: "Available"},
            "due_back": {type: Date, required: false},
            "loaned_to": {type: mongoose.Schema.Types.ObjectId, required: false, ref: "User"}
        },
    ]
})

const Book = mongoose.model("Book", BookSchema);
module.exports = Book;

用户模式

const mongoose = require('mongoose');

const UserSchema = new …