猫鼬删除了许多引荐

Question

我有两个模型Products和Purchases，“购买”是指产品。

现在，我要创建一个删除函数delete Products和所有引用的Purchases。

product.js模型

var productSchema = new Schema({
   name: String,
   id_num: String,
   start_inv: Number,
   date_added: { type: Date, default: Date.now },
   purchases: [{ type: Schema.Types.ObjectId, ref: 'Purchases' }],
});

purchase.js模型

var purchaseSchema = new Schema({
   received: Number,
   purchases_date: { type: Date, default: Date.now },
});

删除路线

router.delete('/', (req, res) => {
Product.findByIdAndRemove(req.params.id, (err, product) => { // product remove working
    Purchases.deleteMany({ _id: { $in: product.purchases } }, function (err, response) { // working but not deleting Purchases
        const data = {
            message: "Product successfully deleted",
            id: product._id
        };
        res.status(200).send(data);
    });
});
})

数据

[
{
    "purchases": [
        "5dbbb5b5b5ae3d34a82f649c"
    ],
    "_id": "5dbbb599b5ae3d34a82f649b",
    "name": "z1",
    "id_num": "z1",
    "start_inv": 100,
    "date_added": "2019-11-01T04:33:29.952Z",
    "__v": 1
}
]

这在执行后仍然有效，但是它只会删除Product，而不会删除Purchases停留数小时的问题。