Mongodb 从mongo数组查询值

我想查询mongo db的数组

样本数据

db.collections.aggregate(
{ $arrayToObject: { "$literal": [
   { "categories.sections.fields.title": "email", "categories.sections.fields.value": "sample@sample.com"}
] } }
)

在数据中，我有多个字段数组，其中包含动态字段名称，这些名称不是强制性的，并且其位置将是随机的。我想提取所有字段的特定标题及其值

{ 
    "_id" : NumberInt(2), 
    "categories" : [
        {
            "sections" : [
                {
                    "fields" : [
                        {
                            "title" : "Name", 
                            "value" : "ABC"
                        }, 
                        {
                            "title" : "Gender", 
                            "value" : "Female"
                        }, 
                        {
                            "title" : "DOB", 
                            "value" : "2010-03-03T18:30:00.000Z"
                        }, 
                        {
                            "title" : "Email", 
                            "value" : "sample@sample.com"
                        }, 
                        {
                            "title" : "Work", 
                            "value" : [
                                "Business"
                            ]
                        }, 
                        {
                            "title" : "Address", 
                            "value" : "new add"
                        }
                    ]
                }, 
                {
                    "fields" : [
                        {
                            "title" : "FirstJob", 
                            "value" : "new"
                        }, 
                        {
                            "title" : "Achievments", 
                            "value" : "abc"
                        }
                    ]
                }
            ]
        }
    ]
}
{ 
    "_id" : NumberInt(6), 
    "categories" : [
        {
            "sections" : [
                {
                    "fields" : [
                        {
                            "title" : "Name", 
                            "value" : "Sample"
                        }, 
                        {
                            "title" : "Gender", 
                            "value" : "Male"
                        }, 
                        {
                            "title" : "DOB", 
                            "value" : "2018-10-22T18:30:00.000Z"
                        }, 
                        {
                            "title" : "Email", 
                            "value" : "o@o.com"
                        }, 
                        {
                            "title" : "Work", 
                            "value" : [
                                "Freelancer"
                            ]
                        }, 
                        {
                            "title" : "Address", 
                            "value" : "old add"
                        }
                    ]
                }, 
                {
                    "fields" : [
                        {
                            "title" : "FirstJob", 
                            "value" : "ddds"
                        }, 
                        {
                            "title" : "Achievments", 
                            "value" : "dsdsds"
                        }
                    ]
                }
            ]
        }
    ]
}

我想使用mongo query或pymongo查找每个id的电子邮件及其价值、成就和价值

预期产出

{ 
    "_id" : NumberInt(6), 
    "categories" : [
        {
            "sections" : [
                {
                    "fields" : [

                        {
                             "Email",  : "o@o.com"

                        }
                    ]
                }, 
                {
                    "fields" : [ 
                        {
                          "Achievments" : "dsdsds"
                        }
                    ]
                }
            ]
        }
    ]
}

我尝试对象数组，但它不是动态的

db.collections.aggregate(
{ $arrayToObject: { "$literal": [
   { "categories.sections.fields.title": "email", "categories.sections.fields.value": "sample@sample.com"}
] } }
)

---

使用$elemMatch，我们可以获取数组的数据

db.getCollection('transactions').find({"categories.sections.fields": {
  "$elemMatch": {
        "$and": [
            {
                "title": { "$eq": "Email"  }

            },
            {
                "title": { "$eq": "Achievments" }
            }

        ]
    }}})

---

谢谢你的回复，但它没有工作，它给了我所有的结果，包括电子邮件和成就。我只想从所有结果的电子邮件和成就。