node.js - 使用 Mongoose 其他行为更新 $inc 然后 MongoDB 更新

Question

我尝试使用 mongoose 更新文档，但失败了。我可以直接在Mongo中成功执行的查询是这样的:

db.orders.update(
    { 
        orderId: 1014428,
        'delivery.items.id': '5585d77c714a90fe0fc2fcb4' 
    },
    {
        $inc: {
            "delivery.items.$.quantity" : 1
        }
    }
)

当我尝试使用 mongoose 运行以下更新命令时:

this.update(
        {
            orderId: this.orderId ,
            "delivery.items.id": product.id
        },
        {
            $inc: {
                "delivery.items.$.quantity" : 1
            }
        }, function (err, raw) {
            if (err) {
                console.log(err);
            }

            console.log('The raw response from Mongo was ', raw);
        }
    );

我看到以下错误:

{ [MongoError: cannot use the part (items of delivery.items.id) to traverse the element ({items: [ { quantity: 1, price: 6.9, name: "Manipulationstechniken", brand: null, id: "5585d77c714a90fe0fc2fcb4" } ]})]
  name: 'MongoError',
  message: 'cannot use the part (items of delivery.items.id) to traverse the element ({items: [ { quantity: 1, price: 6.9, name: "Manipulationstechniken", brand: null, id: "5585d77c714a90fe0fc2fcb4" } ]})',
  index: 0,
  code: 16837,
  errmsg: 'cannot use the part (items of delivery.items.id) to traverse the element ({items: [ { quantity: 1, price: 6.9, name: "Manipulationstechniken", brand: null, id: "5585d77c714a90fe0fc2fcb4" } ]})' }
The raw response from Mongo was  { ok: 0, n: 0, nModified: 0 }

我尝试了很多东西。对此有何建议？

根据要求的架构:

var Order = new Schema({
    orderId: Number,
    orderDate: String,
    customerName: String,
    state: Number,
    delivery: {
         items: {type: Array, default: []},
         state: { type: Number, default: 0 }
    }
});

Answer 1

TL;DR:在进行更高级的查询时使用您的模型 Order 而不是实例 this:

Orders.update(
    {
        orderId: this.orderId ,
        "delivery.items.id": product.id
    },
    {
        $inc: {
            "delivery.items.$.quantity" : 1
        }
    }, function (err, raw) {
        if (err) {
            console.log(err);
        }

        console.log('The raw response from Mongo was ', raw);
    }
);

---

解释:

Model.update() 和 Document.update() 之间的映射差异。

使用模型，则Model.update()将被使用和

Model.update(conditions, doc, options, callback)

将被映射到:

db.collection.update(query = conditions, update = doc, options)

---

当使用实例而不是调用 Document.update()和

Document.update(doc, options, callback)

将映射到以下内容:

db.collection.update(query = {_id: _id}, update = doc, options)