lookup联表查询，如何遍历数组，匹配对应的数据? - WXOPEN Club

表1

"_id":"2a0398605f1114*****d69a167ebf9ed"
"name":"A_TL"
"alistArray":[100,101,200,201]

表二

"_id":"2a0398605f1114*****d69a167ebf9ed"
"alistID":"301"
"time":"20-10-10"
------------------------------------------------------
"_id":"2a0398605f1114*****d69a167ebf9ed"
"alistID":"100"
"time":"21-10-10"
------------------------------------------------------
"_id":"2a0398605f1114*****d69a167ebf9ed"
"alistID":"200"
"time":"20-12-10"
------------------------------------------------------
"_id":"2a0398605f1114*****d69a167ebf9ed"
"alistID":"201"
"time":"10-10-10"
------------------------------------------------------
"_id":"2a0398605f1114*****d69a167ebf9ed"
"alistID":"501"
"time":"25-10-10"

遍历【表1】里”alistArray“字段里的所有值，联表查询【表2】里的”alistID“相匹配的数据，

实现结果：

"_id":"2a0398605f1114*****d69a167ebf9ed"
"name":"A_TL"
"alistArray":[100,101,200,201]
"newlist":[
     {
  "_id":"2a0398605f1114*****d69a167ebf9ed"
  "alistID":"100"
  "time":"21-10-10"
      },
    {
  "_id":"2a0398605f1114*****d69a167ebf9ed"
  "alistID":"200"
  "time":"20-12-10"
     },
    {
  "_id":"2a0398605f1114*****d69a167ebf9ed"
  "alistID":"201"
  "time":"10-10-10"
      }
]

yong26 1楼•3 年前

db.collection('table1').aggregate()
    .match({ _id:"2a0398605f1114*****d69a167ebf9ed" })
    .lookup({
      from: 'table2',
      let: {
        aliArr: '$alistArray'
      },
      pipeline: $.pipeline()
        .match(_.expr($.in(['$alistID', '$$aliArr'])))
        .done(),
      as: 'newlist',
    })
    .end()

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