Question

我需要更新下面提到的集合的userAns，ansBody字段。条件将具有userId，userQuestions._id和quesId。

{ 
"_id" : ObjectId("5b9624b56b0fe824352e887a"), 
"userId" : ObjectId("5b8fd089ee2e6c07765ba024"), 
"userQuestions" : [
    {
        "testStatus" : NumberInt(1), 
        "_id" : ObjectId("5b9624b56b0fe824352e887f"), 
        "questionsId" : [
            {
                "_id" : ObjectId("5b9624b56b0fe824352e8885"), 
                "quesId" : ObjectId("5b94f1e97b8adc3d46854518"), 
                "userAns" : "", 
                "ansBody" : "", 
                "ansStatus" : ""
            }

我尝试过的

  let paramObj={
  userId:"5b8fd089ee2e6c07765ba024",
  quesSetId:"5b9624b56b0fe824352e887b",
  quesId:"5b9619311d9b1b1834f2cd23",
  ansId:"5b9619311d9b1b1834f2cd27",
  ansBody:"abc123"
}
let questionSet=await QuestionSet.update({userId:paramObj.userId,"userQuestions._id":paramObj.quesSetId},
  { $set: {"userQuestions.$[t].questionsId.$[u].ansBody": paramObj.ansBody} },
  { arrayFilters: [ { "t.quesId":paramObj.quesId },{"u.quesId": paramObj.quesId} ] } );

事件虽然它给了我修改后的输出，但是文档没有得到更新。

Answer 1

您必须将对象ID传递为ObjectId类型。

为此，如果您使用的是猫鼬，请使用将该字符串转换为猫鼬对象类型。

    System.Exception: HandleAndroidException ---> System.ArgumentNullException: Value cannot be null.
    Parameter name: method
      at System.Linq.Expressions.Expression.Call(System.Linq.Expressions.Expression instance, System.Reflection.MethodInfo method, System.Linq.Expressions.Expression arg0, System.Linq.Expressions.Expression arg1, System.Linq.Expressions.Expression arg2)[0x0009d] in <c674d6912966428cb26998a802347469>:0 
      at System.Linq.Expressions.Expression.Call(System.Linq.Expressions.Expression instance, System.Reflection.MethodInfo method, System.Collections.Generic.IEnumerable`1[T] arguments) [0x00074] in <c674d6912966428cb26998a802347469>:0 
      at System.Linq.Expressions.Expression.Call(System.Linq.Expressions.Expression instance, System.Reflection.MethodInfo method, System.Linq.Expressions.Expression[] arguments) [0x00000] in <c674d6912966428cb26998a802347469>:0 
      at MvvmCross.Logging.LogProviders.SerilogLogProvider.GetForContextMethodCall() [0x00086] in <df54a54dac96467098c3a9eece96a79b>:0 
      at MvvmCross.Logging.LogProviders.SerilogLogProvider..ctor() [0x00018] in <df54a54dac96467098c3a9eece96a79b>:0 
      at MvvmCross.Core.MvxSetup.CreateLogProvider() [0x00045] in <df54a54dac96467098c3a9eece96a79b>:0 
      at myRouteTracker.Droid.Setup.CreateLogProvider() [0x0002a] in <bdd41c7f90344b17a5e6bc21c3959feb>:0 
      at MvvmCross.Core.MvxSetup.InitializeLoggingServices() [0x00000] in <df54a54dac96467098c3a9eece96a79b>:0 
      at MvvmCross.Core.MvxSetup.InitializePrimary() [0x00016] in <df54a54dac96467098c3a9eece96a79b>:0 
      at MvvmCross.Core.MvxSetupSingleton.StartSetupInitialization() [0x0000a] in <df54a54dac96467098c3a9eece96a79b>:0 
      at MvvmCross.Core.MvxSetupSingleton.InitializeAndMonitor(MvvmCross.Core.IMvxSetupMonitor setupMonitor) [0x00042] in <df54a54dac96467098c3a9eece96a79b>:0 
      at MvvmCross.Droid.Support.V7.AppCompat.MvxSplashScreenAppCompatActivity.OnCreate(Android.OS.Bundle bundle) [0x00019] in <2d476ccd46884988a021d78ffc7a2843>:0 
      at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_(System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <1b4c73c9a2864ea8b5827f31fda08c32>:0 
      at(wrapper dynamic-method) System.Object.e043741f-fba6-4072-a6c2-cfc97949a294(intptr, intptr, intptr)
       --- End of inner exception stack trace ---

我认为它将解决您的问题。

https://mongoosejs.com/docs/api.html#types-objectid-js

有条件的Mongo嵌套数组更新

1 个答案: