Mongodb select 特定元素构成嵌套文档

Question

我有以下 MongoDB 对象结构。我想 select aclpermissions 基于值（使用 Spring MogoTemplate）。例如如果我通过“58dc0bea0cd182789fc62fab”，它应该 return 只有 aclpermissions.READ，但如果我通过“58dc0bd70cd182789fc62faa”，它应该 return 所有 aclpermissions。

如何实现。如果我必须修改数据结构，请建议该怎么做以及如何实现。

{
        "_id" : ObjectId("5900d6abb9eb284a78f5a350"),
        "_class" : "com.debopam.amsapp.model.AMSAppACL",
        "attrUniqueCode" : "USER",
        "attributeVersion" : 1,
        "aclpermissions" : {
                "CRT" : [
                        "58dc0bd70cd182789fc62faa"
                ],
                "READ" : [
                        "58dc0bd70cd182789fc62faa",
                        "58dc0bea0cd182789fc62fab"
                ],
                "UPD" : [
                        "58dc0bd70cd182789fc62faa"
                ],
                "DLT" : [
                        "58dc0bd70cd182789fc62faa"
                ]
        },
        "orgHierachyIdentifier" : "14",
        "orgid" : 14,
        "createDate" : ISODate("2017-04-26T17:19:39.026Z"),
        "lastModifiedDate" : ISODate("2017-04-26T17:19:39.026Z"),
        "createdBy" : "appadmin",
        "lastModifiedBy" : "appadmin"
}

Answer 1

您可以使用来自

的相同更新结构

您可以将下面的聚合查询与 $filter 数组运算符和 $setIsSubset 查询运算符结合使用，它比较并选择输入值为 aclpermission.v 的子集的嵌套文档。

 import static org.springframework.data.mongodb.core.aggregation.ArrayOperators.Filter.filter;
 import static org.springframework.data.mongodb.core.aggregation.Aggregation.*;
 import static java.util.Arrays.asList;

  Aggregation aggregation = newAggregation(
          match(Criteria.where("_id").is(new ObjectId("5900d6abb9eb284a78f5a350"))),
          project()
               .and(filter("aclpermissions")
                                .as("aclpermission")
                                .by(aggregationOperationContext -> new BasicDBObject("$setIsSubset", asList(asList("58dc0bd70cd182789fc62faa"), "$$aclpermission.v"))))
         .as("aclpermissions")
  );

 List<BasicDBObject> results = mongoTemplate.aggregate(aggregation, collectionName,  BasicDBObject.class).getMappedResults();

Mongo Shell 查询：

aggregate([ { "$match" : { "_id" : ObjectId("5900d6abb9eb284a78f5a350")}} , { "$project" : { "aclpermissions" : { "$filter" : { "input" : "$aclpermissions" , "as" : "aclpermission" , "cond" : { "$setIsSubset" : [ ["58dc0bd70cd182789fc62faa"], "$$aclpermission.v"]}}}}}])

更新：

下面的查询将 $match 个 attrUniqueCode 值等于 USER 的文档，后跟 $sort 和 $group 选择最新的文档。 $$ROOT 是表达式变量，用于访问整个文档 $first 以获取最新的文档。

 Aggregation aggregation = newAggregation(
         match(Criteria.where("attrUniqueCode").is("USER")),
         sort(new Sort(Sort.Direction.DESC, "attributeVersion")),
         group().first("$$ROOT").as("latest"),
         project("latest._id", "latest.attrUniqueCode", "latest.attributeVersion")
                        .and(filter("latest.aclpermissions")
                                .as("aclpermission")
                                .by(aggregationOperationContext -> new BasicDBObject("$setIsSubset", asList(asList("58dc0bd70cd182789fc62faa"), "$$aclpermission.v"))))
         .as("aclpermissions")
  );

参考

https://docs.mongodb.com/manual/reference/aggregation-variables/ https://docs.mongodb.com/manual/reference/operator/aggregation/project/ https://docs.mongodb.com/manual/reference/operator/aggregation/filter/

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