我有一个包含多个阶段的聚合管道。在这些阶段之后，简化的结果是这样的:{feature1:[{random:125}],feature2:[{a:"fsfs",val:[125]}]}我想添加一个新字段type，它是根据这些条件设置的:feature1.size>0和feature2.size>0然后输入='back'feature2.size>0然后输入='front'否则类型='none'feature1和feature2数组的内容并不重要，类型取决于数组是否被填充。我的想法是使用带有$cond运算符的$addFields阶段，但我无法弄清楚语法。 最佳答
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":"$shipment_status_history_co
我有两个名为博客类别和SubBlogCategory。BlogCategory的文档由子类别id的objectId数组组成。类目文档如下{"_id":ObjectId("5af2c6e8bfab7269e9a42ded"),"title":"Javascript","subcategory":[ObjectId("5af29fcc9a52623b7088ef4e"),ObjectId("5aebf78681273424e5f55ecc")]}子分类文档如下{"_id":ObjectId("5af29fcc9a52623b7088ef4e"),"title":"Reactjs"}{"_i
我有一个channel收藏{channel:"Xamper",//uniquesubscribers:[ObjectId("5a934e000102030405000000"),ObjectId("5a934e000102030405000001"),ObjectId("5a934e000102030405000002")]}还有一个用户集合{_id:ObjectId("5a934e000102030405000000"),name:"Bradman"},{_id:ObjectId("5a934e000102030405000001"),name:"Hartin"},{_id:Obje
我正在考虑使用最佳实践来解决Mongoose的以下问题。我有三个模式:constSchemaA=newSchema({name:String});constSchemaB=newSchema({schemaA:{type:Schema.Types.ObjectId,ref:'SchemaA',required:true}});constSchemaC=newSchema({schemaB:{type:Schema.Types.ObjectId,ref:'SchemaB'},user:{type:Schema.Types.ObjectId,ref:'User'}});我需要通过附加了sc
我正在尝试制作一个聚合管道-$lookup以从另一个接收仅收集不等于特定_id的项目例如:诊所集合:{_id:1,name:'somename1'}{_id:2,name:'somename2'}{_id:3,name:'somename3'}业务集合:{_id:1,name:"somebusinessname",clinics:[1,2,3]}我的聚合管道查询:db.business.aggregate([{$match:{_id:mongoose.Types.ObjectId(businessId)}},{$lookup:{from:"ClinicsCollection",loca
我有两个集合，并试图在两个不同的条件下得到总金额的总和。这是我的代码:db.drivers.aggregate([{$lookup:{from:"bookings",let:{driver_id:"$_id"},pipeline:[{$match:{$expr:{$eq:["$driverId","$$driver_id"]}}},{$group:{_id:"$driverId",totalAmount:{$sum:"$driverAmount"}}}],as:"bookingdata",pipeline:[{$match:{$expr:{$and:[{$eq:["$driverId"
我有3个收集司机、用户和调度员。调度员可以是司机或用户我的调度员集合是这样的，{"_id":ObjectId("5c9bb56a56f1a43e8aedf3c1"),"dispatcherId":ObjectId("5c3382fe3406281ba6863f7e"),"type":"driver","recordedTime":ISODate("2019-03-27T17:39:54.030Z"),"isEnable":true,"dispatchPackageType":"commission","__v":0}dispatcherId来自驱动程序或用户集合。类型是“驱动程序”或“
在三个集合中使用聚合查找后，我得到以下结果。[{_id:"henten",location:"someplace",devices:[{"d_id":'d0001',"z_id":'z2001'},{"d_id":'d0002',"z_id":'z2002'}],store:[{"z_name":'vera',"z_id":'z2001'},{"z_name":'ghora',"z_id":'z2002'}]}]如果devices.z_id与store.z_id匹配，我需要将“d_id”的值作为数组推送到“store”的字典中，并添加到名为“DID”的新字段中。我尝试了以下方法:{$a
我试图了解在JavaSpringBoot中定义模型时，@Indexed和@Field这两个不同的注解有何不同。publicclassNotation{@IdprivateStringid;@Field("value")privateStringvalue;@Field("description")privateStringdescription;@Field("frequency")privateintfrequency;}publicclassNotation{@IdprivateStringid;@Indexed("value")privateStringvalue;@Indexe
