Question

{ 
    "_id" : ObjectId("586aac4c8231ee0b98458045"), 
    "store_code" : NumberInt(10800), 
    "counter_name" : "R.N.Electric", 
    "address" : "314 khatipura road", 
    "locality" : "Khatipura Road (Jhotwara)", 
    "pincode" : NumberInt(302012), 
    "town" : "JAIPUR", 
    "gtm_city" : "JAIPUR", 
    "sales_office" : "URAJ", 
    "owner_name" : "Rajeev", 
    "owner_mobile" : "9828024073", 
    "division_mapping" : [//this contains only 1 element in every doc
        {
            "dvcode" : "cfc", 
            "dc" : "trade", 
            "beatcode" : "govindpura", 
            "fos" : {
                "_id" : ObjectId("586ab8318231ee0b98458843"), 
                "loginid" : "9928483483", 
                "name" : "Arpit Gupta", 
                "division" : [
                    "cfc", 
                    "iron"
                ], 
                "sales_office" : "URAJ", //office
                "gtm_city" : "JAIPUR" //city
            }, 
            "beat" : {
                "_id" : ObjectId("586d372b39f64316b9c3cbd7"), 
                "division" : {
                    "_id" : ObjectId("5869f8b639f6430fe4edee2a"), 
                    "clientdvcode" : NumberInt(40), 
                    "code" : "cfc", 
                    "name" : "Cooking  & Fabric Care", 
                    "project_code" : "usha-fos", 
                    "client_code" : "usha", 
                    "agent_code" : "v5global"
                }, 
                "beatcode" : "govindpura", 
                "sales_office" : "URAJ", 
                "gtm_city" : "JAIPUR", 
                "active" : true, 
                "agency_code" : "v5global", 
                "client_code" : "USHA_FOS", 
                "proj_code" : "usha-fos", 
                "fos" : {
                    "_id" : ObjectId("586ab8318231ee0b98458843"), 
                    "loginid" : "9928483483", 
                    "name" : "Arpit Gupta", 
                    "division" : [
                        "cfc", 
                        "iron"
                    ], 
                    "sales_office" : "URAJ", 
                    "gtm_city" : "JAIPUR"
                }
            }
        }
    ], 
    "distributor_mail" : "sunil.todi@yahoo.in", 
    "project_code" : "usha-fos", 
    "client_code" : "usha", 
    "agent_code" : "v5global", 
    "distributor_name" : "Sundeep Electrical"
}

我在division_mapping数组中只有1个元素，我想找到那些在division_mapping中交换dc的文档。

我试过以下：

"division_mapping":{$elemMatch:{$eq:{"dc":"trade"}}}})

不知道我做错了什么。 //也许我必须解开阵列，但还有其他方法吗？

Answer 1

根据MongoDB文档

$elemMatch运算符匹配包含数组的文档包含至少一个与所有指定查询匹配的元素的字段标准。

根据上述说明，只检索div_mapping为dc的文档，请尝试执行下面提到的查询

db.collection.find({division_mapping:{$elemMatch:{dc:'trade'}}})

如何在mongo中从数组中查找内容

1 个答案: