我有一个要使用IAggregateFluent执行的聚合管道。这是与数据库的类映射publicclassCard{publicObjectIdId{get;set;}publicstringCardNumber{get;set;}publicstringCustomerId{get;set;}publicdecimalBalanceAmount{get;set;}publicstringCurrency{get;set;}publicListTransactions{get;set;}}和CardTransaction一样publicclassCardTransaction{//pub
有了这些数据:{"_id":ObjectId("576948b4999274493425c08a"),"virustotal":{"scan_id":"4a6c3dfc6677a87aee84f4b629303c40bb9e1dda283a67236e49979f96864078-1465973544","sha1":"fd177b8c50b457dbec7cba56aeb10e9e38ebf72f","resource":"4a6c3dfc6677a87aee84f4b629303c40bb9e1dda283a67236e49979f96864078","response_code"
我有产品组文档，如下所示:[{options:[],products:[{sku:'123',name:'Productname1'},{sku:'476',name:'Productname2'}]},{options:[],products:[{sku:'265',name:'Productname3'},{sku:'789',name:'Productname4'}]}]我需要做的是一个高级查询，其中不仅包括对产品组进行排序，还包括对其中的产品数组进行排序。我目前正在尝试的方法是将aggregate()与$unwind和$sort一起使用，然后尝试将组重新组合在一起(在$unwi
done_status=['BAD_PU','TO_WH','RCVDPORT','RCVD','BAD_DEL','MISSFLT','OFFLOAD']shipments=db.db_shipment.aggregate([{"$lookup":{"from":"db_shipment_status_history","localField":"_id","foreignField":"fk_shipment_id","as":"shipment_status_history_collection"}},{"$unwind":"$shipment_status_history_co
以如下数据为例:{_id:1,item:"abc",stock:[{size:"S",color:"red",quantity:25},{size:"S",color:"blue",quantity:10},{size:"M",color:"blue",quantity:50}]}{_id:2,item:"def",stock:[{size:"S",color:"blue",quantity:20},{size:"M",color:"blue",quantity:5},{size:"M",color:"black",quantity:10},{size:"L",color:"red",
问题是给定的文档有两个数组，每个数组都包含文档作为它们的元素，我想找到本质上具有的文档:"obj1.a"==="obj2.b"所以给定示例文档，但实际上期望更大的数组，那么该怎么做呢？:{"obj1":[{"a":"a","b":"b"},{"a":"a","b":"c"}],"obj2":[{"a":"c","b":"b"},{"a":"c","b":"c"}]},{"obj1":[{"a":"a","b":"b"}],"obj2":[{"a":"a","b":"a"}]}一种方法可能是将它们与JavaScript和$where进行比较运算符，但从JavaScript中循环大型数组听
假设我正在使用$unwind在Mongoose模式中的字段上根据上面的链接，如果字段不存在，则unwind将忽略输入文档我怎样才能防止这种情况发生，即使字段不存在，即不忽略输入文档，也不会在没有展开过程的情况下返回查询结果ifaparticularfieldexistsIwanttodounwindandsomemorestuff(projectandgroup)elseIwantinputdocumentnochangesinthiscase 最佳答案 AccordingtotheabovelinkIffieldisnotpres
我有以下数据集:{"_id":ObjectId("57684f2b61f2af6d49fa6dbd"),"firstname":"First1","surname":"Sur1","email":"first1@sur1.com","goals":[{"gId":"base1","recordDate":ISODate("2016-06-21T20:05:48.972Z")},{"gId":"base2","recordDate":ISODate("2016-06-21T20:05:48.972Z")},{"gId":"base1","recordDate":ISODate("2016
我在mongodb中有以下客户订单数据"_id":7,"customername":"JohnSmith","OrderItem":[{"product_category":"Mobile","price":900},{"product_category":"Computer","price":4200.48},{"product_category":"TV","price":670.20},{"product_category":"TV","price":960.52}]我需要对每个产品类别进行平均，如下所示:"_id":7,"customername":"JohnSmith","O
我有带有OrderItems的对象Order。我需要按字段ProductId(按orderItems)对数据进行分组并显示每个产品的总和。此解决方案效果很好:varcollection=database.GetCollection("Order");varresult=collection.Aggregate().Unwind(x=>x.OrderItems).Group(newBsonDocument{{"_id","$OrderItems.ProductId"},{"suma",newBsonDocument{{"$sum","$OrderItems.UnitPriceExclTa
