Question

我的乔布斯收藏如下

{
    "_id" : ObjectId("5b6979339bcdb5d4ae64498f"),
    "jobProfile" : "Java Developer",
    "jobID" : "1",
    "companyName" : "xyz",
    "openingsCount" : 10,
    "jobType" : "Fulltime",
    "jobDescription" : "profile description",
    "contactEmail" : "xyz@gmail.com",
    "contactWebsite" : "www.xyz.com",
    "postingDate" : "07-08-2018 04:21:22",
    "jobstatus" : "Active",
    "jobEndDate" : ISODate("2018-08-14T23:59:59.999Z"),
    "jobEndDateMilliSeconds" : 1534204859999.0
}


{
    "_id" : ObjectId("5b6aba4c9bcdb5d4ae649197"),
    "jobProfile" : "Python Developer",
    "jobID" : "2",
    "companyName" : "abc",
    "openingsCount" : 10,
    "jobType" : "Fulltime",
    "jobDescription" : "profile description",
    "contactEmail" : "abc@gmail.com",
    "contactWebsite" : "www.abc.com",
    "postingDate" : "07-08-2018 04:21:22",
    "jobstatus" : "Active",
    "jobEndDate" : ISODate("2018-08-14T23:59:59.999Z"),
    "jobEndDateMilliSeconds" : 1534204859000.0
}

{
    "_id" : ObjectId("5b6aba4c9bcdb5d4ae64919q"),
    "jobProfile" : "nodejs Developer",
    "jobID" : "3",
    "companyName" : "abc",
    "openingsCount" : 15,
    "jobType" : "Fulltime",
    "jobDescription" : "profile description",
    "contactEmail" : "abc@gmail.com",
    "contactWebsite" : "www.abc.com",
    "postingDate" : "07-08-2018 04:21:22",
    "jobstatus" : "not Active",
    "jobEndDate" : ISODate("2018-08-14T23:59:59.999Z"),
    "jobEndDateMilliSeconds" : 1534204859000.0
}

我的用户集合是

"userID" : "1",
    "userAppliedJobs" : [ 
        "1", 
        "2",
        "3"
    ]

我希望在具有userID：1的userAppliedJobs数组中存在的所有具有jobID的文档以及jobStatus都处于活动状态。

Answer 1

您可以使用Mongo 3.6 $lookup，然后将$projection与$filter一起使用：

db.getCollection('jobusers').aggregate([
{ $lookup: {
    from: 'jobs',
    localField: 'userAppliedJobs',
    foreignField: 'jobID',
    as: 'userJobs',
  }
},
{ "$project": {
        "id": 1,
        "jobs": {
           "$filter": {
               "input": "$userJobs",
               "as": "job",
               "cond": { "$eq": [ "$$job.jobstatus", "Active" ] }
           }
        }
    }}
])

在此示例中，具有3个作业的集合称为jobs，而具有单个用户jobusers的集合称为。更改此名称以使其与您的姓名相符。

$lookup部分是必需的，因为您要与另一个集合进行交叉引用。有点棘手的部分是projection filtering。

获取所有集合中存在于另一个数组中的所有文档

1 个答案: