The JSON property is showing as undefined despite the fact that the variable holding the data is filled with a JSON object

My current challenge involves retrieving a MongoDB document from my database using a get request. I have successfully tested the URL via Postman and it returns the document as expected, indicating that the issue lies within the frontend rather than the server. When attempting the same operation on the frontend, the data is retrieved and stored in the variable res, which is then assigned to this.englishteam for access outside the GetSingleEnglishTeam function scope.

public teamenglish!: EnglishTeam;

GetSingleEnglishTeam(_id: string) {
    this.englishTeamService.GetSingleEnglishTeam(_id).subscribe((res)=> {
      console.log("The team: "+ res);
      this.teamenglish = res;
      // console.log(this.teamenglish);

    })
  }

However, upon trying to access the ClubName stored in teamenglish, an undefined error occurs:

ERROR TypeError: Cannot read property 'ClubName' of undefined at ClubHonoursComponent_Template (club-honours.component.html:9)

Club-honours.component.html

<div class="row">
<div class="column">
  <div class="PremierLeagues" >
    {{teamenglish.ClubName}}
  </div>
</div>

Get Request to the Server

GetSingleEnglishTeam(_id: string){
console.log( "ID is "+ _id);

return this.http.get<EnglishTeam>('http://localhost:3000/api/getTeamEn/' + `${_id}`);
}

Upon console logging the variable containing the JSON object, [Object Object] is displayed.

My objective is to send a getOne request to the server and have it return the single document. Can anyone identify where I may have made a mistake?

Answer №1

The issue arises because the template is initialized before the teamenglish variable is set within the callback of the subscribe function.

There are three approaches to solve this problem:

1.) Add the Safe navigation operator (?) in your template file like so -

{{teamenglish?.ClubName}}

2.) Utilize *ngIf on a container div to render it only when the teamenglish object is available (which occurs once the observable callback sets it) e.g. -

<div *ngIf="teamenglish" class="PremierLeagues">
    {{teamenglish.ClubName}}
  </div>

3.) Use the async pipe in your template to handle the subscription and value resolution automatically:

In your ts file, assign the observale to a variable as follows -

const obs = this.englishTeamService.GetSingleEnglishTeam(_id)

Then in your template file -

{{obs | async | json}}

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