Question

我有两个清单，例如清单和任务。两种模式如下所示

清单结构看起来像beow

{
        "_id": "5b7d0f77e231b6b530b0ee5a",
        "audit_checklist_type": "Weekly"

    },
    {
        "_id": "5b7d3f33e7a57f38084efb09",
        "audit_checklist_type": "Daily"
    }

任务架构如下所示

    { 
        "_id": "5b7d65daf74be318e8378cf9",
        "checklist_id": "5b7d3f33e7a57f38084efb09"
    },
    {
        "_id": "5b7d662df74be318e8378cfb",
        "checklist_id": "5b7d3f33e7a57f38084efb09"
    }

我的查询是

AuditChecklist.aggregate([
{ $match: {
  $and: [
        audit_checklist_type : "Daily"
  ]
  } },
  {
     $lookup: {
        from: 'AuditTask',
        localField: '_id',
        foreignField: 'checklist_id',
        as: 'TaskData'
     }
  },


  ]).exec();

我正在尝试获得类似的输出

    {
        "_id": "5b7d3f33e7a57f38084efb09",
        TaskData": [
                    { 
                      "_id": "5b7d65daf74be318e8378cf9",
                      "checklist_id": "5b7d3f33e7a57f38084efb09"
                    },
                    {
                      "_id": "5b7d662df74be318e8378cfb",
                      "checklist_id": "5b7d3f33e7a57f38084efb09"
                    }
                   ]
    }

但是对我而言，结果TaskData输出为空。任何帮助是极大的赞赏。预先感谢！

Answer 1

Mongooose使数据库名称复数，所以应该使用AuditTask而不是使用audittasks

OR

您可以先将数据库导入文件中，例如

import AuditTask from './AuditTask` 
or 
const AuditTask = require('./AuditTask')

并在您的$lookup聚合中使用它

{ '$lookup': {
  'from': AuditTask.collection.name,
  'localField': '_id',
  'foreignField': 'checklist_id',
  'as': 'TaskData'
}}

$使用猫鼬的查找

1 个答案: