$pull 在 mongosh 中有效，但在 mongoose 中无效答案

【问题标题】：$pull works in mongosh but not in mongoose$pull 在 mongosh 中有效，但在 mongoose 中无效
【发布时间】：2021-12-14 15:14:22
【问题描述】：

用户架构：

const UserSchema = new mongoose.Schema(
  {
    contacts: {
      type: Array,
      default: [],
    }
  }

);

module.exports = mongoose.model("User", UserSchema);

MongoDB 中的数据

{
    "_id": ObjectId("6171fbcd85279d467c9b5be9"),
    "contacts":[
        {
            "_id": ObjectId("61a7b499455e053ae4e4baeb"),
            "firstName":"Johnny",
            "lastName":"Cool",
            "occupation":"Programmer",
            "company":"Cool Comp."
        },

        {
            "_id":ObjectId("61a7b4be455e053ae4e4baec"),
            "firstName":"Evan",
            "lastName":"Evernost",
            "occupation":"Manager",
            "company":"Best Comp."
        }
    ]
}

此删除查询在 mongosh 中有效，联系人已从数据库中删除

db.users.updateOne(
  {'_id':ObjectId('6171fbcd85279d467c9b5be9')},
    {$pull: 
      {'contacts':
        {'_id': ObjectId('61a7b499455e053ae4e4baeb')}
      }
    }
)

生成的数据如下所示：

{
    "_id": ObjectId("6171fbcd85279d467c9b5be9"),
    "contacts":[
        {
            "_id":ObjectId("61a7b4be455e053ae4e4baec"),
            "firstName":"Evan",
            "lastName":"Evernost",
            "occupation":"Manager",
            "company":"Best Comp."
        }
    ]
}

但是，当我在使用 npm 的 mongoose 库中运行此查询时，命令“成功”但联系人并未从数据库中删除。

User.updateOne(
  {'_id': mongoose.types.ObjectId('6171fbcd85279d467c9b5be9')},
    {$pull: 
      {'contacts':
        {'_id': mongoose.types.ObjectId('61a7b499455e053ae4e4baeb')}
      }
    }
)

生成的数据如下所示

{
    "_id": ObjectId("6171fbcd85279d467c9b5be9"),
    "contacts":[
        {
            "_id": ObjectId("61a7b499455e053ae4e4baeb"),
            "firstName":"Johnny",
            "lastName":"Cool",
            "occupation":"Programmer",
            "company":"Cool Comp."
        },

        {
            "_id":ObjectId("61a7b4be455e053ae4e4baec"),
            "firstName":"Evan",
            "lastName":"Evernost",
            "occupation":"Manager",
            "company":"Best Comp."
        }
    ]
}

而不是这个：

{
    "_id": ObjectId("6171fbcd85279d467c9b5be9"),
    "contacts":[
        {
            "_id":ObjectId("61a7b4be455e053ae4e4baec"),
            "firstName":"Evan",
            "lastName":"Evernost",
            "occupation":"Manager",
            "company":"Best Comp."
        }
    ]
}

不确定是什么问题。

【问题讨论】：

标签： mongoose mongoose-schema mongo-shell

【解决方案1】：

因为 updateOne 是一个异步函数，所以只需添加 await 关键字就可以了

await User.updateOne(
  {'_id': mongoose.types.ObjectId('6171fbcd85279d467c9b5be9')},
    {$pull: 
      {'contacts':
        {'_id': mongoose.types.ObjectId('61a7b499455e053ae4e4baeb')}
      }
    }
)

【讨论】：