使用 $regex 过滤数组元素答案

【问题标题】：Filter array elements with $regex使用 $regex 过滤数组元素
【发布时间】：2016-09-26 13:38:35
【问题描述】：

 ///sample Data 
{
    "_id" : "CUST1234",
    "Phone Number" : "9585290750",
    "First Name" : "jeff",
    "Last Name" : "ayan",
    "Email ID" : "",
    "createddate" : 1462559400000.0,
    "services" : [ 
        {
            "type" : "Enquiry",
            "timeSpent" : "0:00",
            "trxID" : "TRXE20160881",
            "CustomerQuery" : "Enquiry about travell agent numbers in basaveshwara nagara",
            "ServiceProvided" : "provided info through whatsapp",
            "Category" : "Tours/Travels",
            "callTime" : "2016-05-06T18:30:00.000Z",
            "ActualAmount" : 0,
            "FinalAmount" : 0,
            "DiscountRuppes" : 0,
            "DiscountPerctange" : 0
        }, 
        {
            "type" : "Enquiry",
            "timeSpent" : "0:00",
            "trxID" : "TRXE20160882",
            "CustomerQuery" : "Enquiry about Electric bill payment of house",
            "ServiceProvided" : "Service provided",
            "Category" : "Utility Services",
            "callTime" : "2016-05-10T18:30:00.000Z",
            "ActualAmount" : 0,
            "FinalAmount" : 0,
            "DiscountRuppes" : 0,
            "DiscountPerctange" : 0
        }, 
        {
            "type" : "Enquiry",
            "timeSpent" : "0:00",
            "trxID" : "TRXE20160883",
            "CustomerQuery" : "Enquiry about KPSC office number",
            "ServiceProvided" : "provided info through whatsapp",
            "Category" : "Govt Offices/Enquiries",
            "callTime" : "2016-05-13T18:30:00.000Z",
            "ActualAmount" : 0,
            "FinalAmount" : 0,
            "DiscountRuppes" : 0,
            "DiscountPerctange" : 0
        }, 
        {
            "type" : "Enquiry",
            "timeSpent" : "0:00",
            "trxID" : "TRXE20160884",
            "CustomerQuery" : "Enquiry about Sagara appolo hospital contact number",
            "ServiceProvided" : "provided the information through call",
            "Category" : "Hospitals/Equipments",
            "callTime" : "2016-05-14T18:30:00.000Z",
            "ActualAmount" : 0,
            "FinalAmount" : 0,
            "DiscountRuppes" : 0,
            "DiscountPerctange" : 0
        },
 ]
}

预期输出：与“服务”字段中搜索框中的特定字符串匹配的整个数据。

     db.collection.aggregate([
        { 
            $match: { 
                "Phone Number": "9585290750", 
                "services": { $regex: "/^t/", $options: "s i" }
            }
        },                     
        {
            $project: {
                "Services": "services" 
            }
        }
    ]);

我在上述集合中的正则表达式部分遇到问题，services 是一个数组字段。请帮我过滤数据。

【问题讨论】：

stackoverflow.com/questions/16252208/… 这可能对你有帮助
您尝试与正则表达式匹配的嵌入式文档字段是什么？
您文档中的搜索框是什么？您不能将正则表达式应用于数组您想要将正则表达式应用到的子文档中的字段名称是什么？
我只想将数据与服务中的所有字段匹配并在表格中显示输出

标签： regex mongodb mongodb-query aggregation-framework

【解决方案1】：

伙计们，因为我是 Mongodb 的新手，所以我花了一天的时间才找到合适的解决方案来完成我的任务。我有一个解决我的问题的方法。如果你们有比这更好的查询，只需发布或修改它......

 db.collections.aggregate([
        {"$match":{"Corporate_ID":"id"}},
        {"$unwind":"$services"},
        {"$match":{"$or":[
            {"services.type":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.timeSpent":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.trxID":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.CustomerQuery":{$regex:'F',"$options": "i"}},
            {"services.ServiceProvided":{$regex:'F',"$options": "i"}},
            {"services.Category":{$regex:'F',"$options": "i"}},
            {"services.callTime":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.ActualAmount":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.FinalAmount":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.DiscountRuppes":{$regex:'TRXF2016088142',"$options": "i"}},
            {"services.DiscountPerctange":{$regex:'TRXF2016088142',"$options": "i"}}                     
            ]}},
        {"$unwind":"$services"},
        {"$project":{
            "service":"$services"}
               }        
])

【讨论】：

【解决方案2】：

这是因为您将 JavaScript 正则表达式对象的字符串传递给 $regex。将您的正则表达式更改为以下之一。

"service": { "$regex": /^t/, "$options": "si" }

或

"service": { "$regex": "^t", "$options": "si" }

【讨论】：

仍然收到错误“管道阶段规范对象必须包含一个字段”。将正则表达式传递给数组字段是否有任何问题。
请使用示例文档和预期结果编辑您的问题。
它也试过这个 db.collections.aggregate([ {$match:{"Phone Number" : "9159571195","services":{"$regex": /^E/, " $options": "si"}}}, { $project: { Number: '$Phone Number', Name: '$services' } } ])