我很难解决这个mongodb(mongoose)问题。有Guess(_id,title,tags)与tags是tags_id数组(从Tag架构中引用)。varmongoose=require('mongoose');varSchema=mongoose.Schema;varschema=mongoose.Schema({title:{type:Schema.Types.Mixed,required:true},tags:[{type:Schema.Types.ObjectId,ref:'Tag',required:false,default:[]}]});schema.index({'
我很难解决这个mongodb(mongoose)问题。有Guess(_id,title,tags)与tags是tags_id数组(从Tag架构中引用)。varmongoose=require('mongoose');varSchema=mongoose.Schema;varschema=mongoose.Schema({title:{type:Schema.Types.Mixed,required:true},tags:[{type:Schema.Types.ObjectId,ref:'Tag',required:false,default:[]}]});schema.index({'
我有一个表格并保存如下:{"_id":ObjectId("5716617f4af77ca97a9614bd"),"count":1,"author":"Tony","music":[{"_id":ObjectId("571661cd4af77ca97a9614c1"),"count":2,"author":"Tony"}]}{"_id":ObjectId("5716617f4af77ca97a9614be"),"count":2,"author":"Joe","music":[{"_id":ObjectId("571661cd4af77ca97a9614c0"),"count":1,"
我有一个表格并保存如下:{"_id":ObjectId("5716617f4af77ca97a9614bd"),"count":1,"author":"Tony","music":[{"_id":ObjectId("571661cd4af77ca97a9614c1"),"count":2,"author":"Tony"}]}{"_id":ObjectId("5716617f4af77ca97a9614be"),"count":2,"author":"Joe","music":[{"_id":ObjectId("571661cd4af77ca97a9614c0"),"count":1,"
我在我的Node.js-express应用程序中使用Resumable.js。我可以知道文件传输成功了，因为我可以console.log(req.body)并在下面看到这个......{resumableChunkNumber:'77',resumableChunkSize:'1048576',resumableCurrentChunkSize:'1064195',resumableTotalSize:'80755971',resumableType:'',resumableIdentifier:'80755971-humanfastq',resumableFilename:'huma
我在一个项目上工作了几天并且工作正常。但是今天我在模拟器应用程序中运行我的应用程序，在启动屏幕上暂停而不进入主要Activity并且它显示错误:-执行停止不是恢复的Activity和ava.lang。RuntimeException:执行停止未恢复的Activity我的SplashScreen.java:-publicclassSplashScreenextendsAppCompatActivity{privatestaticintSPLASH_TIME_OUT=3000;Booleanflag=false;publicstaticActivityactivity_splash;@Ov
MongoDB聚合每分钟都在指数级地复杂化!我目前是$unwind一个嵌套数组，然后通过_id中的每个对象执行$lookup展开的嵌套数组。我最后的尝试是用$group来逆转展开。但是，我无法重建原始嵌入数组及其原始属性名称，以及每个文档的其余原始直接属性。这是我目前的尝试:db.users.aggregate([{$unwind:"$profile",$unwind:{path:"$profile.universities",preserveNullAndEmptyArrays:true}},{$lookup:{from:"universities",localField:"prof
MongoDB聚合每分钟都在指数级地复杂化!我目前是$unwind一个嵌套数组，然后通过_id中的每个对象执行$lookup展开的嵌套数组。我最后的尝试是用$group来逆转展开。但是，我无法重建原始嵌入数组及其原始属性名称，以及每个文档的其余原始直接属性。这是我目前的尝试:db.users.aggregate([{$unwind:"$profile",$unwind:{path:"$profile.universities",preserveNullAndEmptyArrays:true}},{$lookup:{from:"universities",localField:"prof
假设我有17,000个文档，其结构类似于以下文档:{someInfo:"blahblahblah",//andanotherdozenorsoattributeshere,followedby:answers:[{email:"test@test.com,values:[{value:1,label:"test1"},{value:2,label:"test2"}]},{email:"someone@somewhere.com,values:[{value:6,label:"test1"},{value:1,label:"test2"}]}]}假设我使用聚合来展开answers和ans
我有以下文档结构{"app_id":"DHJFK67JDSJjdasj909","date":ISODate("2014-08-07T00:00:00.000Z"),"event_count":100,"events":[{"type":0,"value":12},{"type":10,"value":24},{"type":20,"value":36},{"type":30,"value":43}],"unique_events":[{"type":0,"value":5},{"type":10,"value":8},{"type":20,"value":12},{"type":30
