如何从mongo中的数组中找到某些东西

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{ 
    "_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" : "[email protected]", 
    "project_code" : "usha-fos", 
    "client_code" : "usha", 
    "agent_code" : "v5global", 
    "distributor_name" : "Sundeep Electrical" 
}

我在division_mapping的数组中只有1个元素，我想查找其division_mapping中的dc是交易的那些文档。如何从mongo中的数组中找到某些东西

我曾尝试以下操作：

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

不知道我在做什么错。 //也许我必须展开阵列，但有没有其他方法？

来源

2017-01-23 Akshay

根据MongoDB的文档

的$elemMatch操作者匹配包含与所有指定的查询条件匹配的至少一个元素的数组字段的文档。

根据上述说明仅检索文件，其DC IN division_mapping是贸易请尝试执行下文提到的查询

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

来源

2017-01-23 09:32:17

如何从mongo中的数组中找到某些东西

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