Question

我正在尝试通过每个文档中存在的地址对多个文档进行分组。但是，地址本身就是子文档，并存储在数组中。如果它们在数组中甚至存在一个相同的地址，但不一定在相同的索引中，则我需要将两个文档组合在一起。能做到吗？文档的一般结构如下：

{
"_id" : ObjectId("5ccb0983258f7a1694f30e7d"),
"name" : {
    "first" : "John",
    "middle" : "J",
    "last" : "Doe",
    "prefix" : "Mr.",
    "professionalSuffixes" : [ 
        "MD"
    ],
    "generationalSuffix" : "Jr"
},
"ssn" : "123-45-6789",
"birthDate" : "1996-06-28",
"gender" : "Unknown",
"maritalStatus" : "Separated",
"postalAddresses" : [ 
    {
        "streetAddress" : [ 
            "23 LeeWay RD", 
            "APT 342"
        ],
        "officeSuite" : "4743",
        "apartmentNumber" : "022",
        "postOfficeBoxNumber" : "12345",
        "postalCode" : "12345",
        "city" : "St Louis",
        "state" : {
            "code" : "MO",
            "name" : "Missouri",
            "description" : "Test Description"
        },
        "country" : {
            "name" : "United States of America",
            "iso2Code" : "US",
            "iso3Code" : "USA",
            "description" : "Test Description"
        }
    }
]
}

谢谢。

Answer 1

根据您对我的评论，您只需要先取消该字段：

{
 $unwind: "$postalAddresses"
},
{ 
  $group: {
     _id: group_cond,
     docs_ids: {$push: "$_id"}
  }
}

现在组条件应该是使地址“唯一”的任何条件，它应该看起来像这样：

{ country: "$postalAddresses.country.name", state: "$postalAddresses.state.code", city: "$postalAddresses.city", street: "$postalAddresses.street."}

如果多个文档中的数组包含另一个文档的数组中存在的元素，如何对它们进行分组？

1 个答案: