Question

我有一个以下架构的文档。我想根据键building和rooms查找文档。这些键嵌套在列表中，该列表嵌套在列表中。我在下面的架构中提到了列表rooms(OR)，列表Department1(AND)和列表Departments(OR)之间想要的关系。

{
    "Departments" : [ 
        {
            "Department" : [ 
                {
                    "building" : "alps",
                    "rooms" : [ 
                        "1","2"    ------ OR relationship ------
                    ]
                }, ------ AND relationship ------
                {
                    "building" : "sierra",
                    "rooms" : [ 
                        "1"
                    ]
                }
            ]
        }, ------ OR relationship ------
        {
            "Department" : [ 
                {
                    "building" : "sierra",
                    "rooms" : [ 
                        "1"
                    ]
                }
            ]
        }
    ]
}

在这种情况下，我被困在下面的filter_query中-

db.getCollection('department_buildings').find({"$and":[{"Departments.Department.building":"alps","Departments.Department.rooms": {"$in":["1","2"]}}, {"Departments.Department.building":"sierra","Departments.Department.rooms": {"$in":["1"]}}]})

此查询不适用于Department (AND)关系，因为它在Departments上查找房间/建筑物，而我们想查找此AND关系在Department中。因此，此查询将返回上面的文档，但同时也会返回下面的文档，这不是预期的结果。

{
    "Departments" : [ 
        {
            "Department" : [ 
                {
                    "building" : "alps",
                    "rooms" : [ 
                        "1","2"
                    ]
                }
            ]
        },
        {
            "Department" : [ 
                {
                    "building" : "sierra",
                    "rooms" : [ 
                        "1"
                    ]
                }
            ]
        }
    ]
}

我是MongoDB的新手，不确定如何实现。

Answer 1

除了我之前使用的$elemMatch之外，我还可以使用@all和$and来实现这一目标。以下是对我有用的查询。

db.getCollection('catalog_personalization_policies').find({
    "$and": [
        {
            "Departments": {
                "$elemMatch": {
                    "Department": {
                        "$all": [
                            {
                                "$elemMatch": {
                                    "rooms": {
                                        "$in": [
                                            "1"
                                        ]
                                    },
                                    "building": "alps"
                                }
                            },
                            {
                                "$elemMatch": {
                                    "rooms": {
                                        "$in": [
                                            "1"
                                        ]
                                    },
                                    "building": "sierra"
                                }
                            }
                        ]
                    }
                }
            }
        }
    ]
})

MongoDB-查询嵌套在对象数组内的数组

1 个答案: