The search is fruitless for a distinguishable entity '[object Object]' falling under the category of 'object'. In Angular 8, NgFor exclusively allows binding to Iterables like Arrays

My goal is to display a list of users using the ngFor directive. However, when I attempt to do this, the console displays an error message:

Error

ERROR Error: Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.

Group-component.ts

groupUsers: any[] = [];

this.groupService.getGroupUsers(this.groupId)
  .subscribe(groupUsers => {
    this.groupUsers = groupUsers;
  });

Group-service.ts

getGroupUsers(groupId: number): Observable<any[]> {
      return this.http.get<any[]>(this.baseUrl + 'GroupAttendance/GroupUsers/' + groupId);
}

Group-component.html

<div *ngFor="let user of groupUsers" class="modal-body">
  <div class="card">
   <div class="card-body">
    <div class="form-group">
      <p>{{ user.user.knownAs }}</p>
    </div>
  </div>
</div>

Upon receiving data from the server, the response can be found here: https://i.sstatic.net/hU89W.png

I am puzzled by why the console is showing me this error.

Answer №1

Within your group.component.html file

   <div *ngIf="groupUsers?.length > 0">
    <div *ngFor="let user of groupUsers" class="modal-body">
      <div class="card">
       <div class="card-body">
        <div class="form-group">
          <p>{{ user.user.knownAs }}</p>
        </div>
      </div>
    </div>
   </div>

Answer №2

If you're encountering errors while trying to display array data in HTML, it may be because the data is not yet ready for rendering. Before attempting to show the data on an HTML file, ensure that it is prepared for display. One way to check this is by using the following method:

*ngIf="groupUsers?.length > 0" // Verify that groupUsers contains data and has a length greater than 0.

.

<div *ngIf="groupUsers?.length > 0">

    <div *ngFor="let user of groupUsers" class="modal-body">
      <div class="card">
       <div class="card-body">
        <div class="form-group">
          <p>{{ user.user.knownAs }}</p>
        </div>
      </div>
    </div>
</div>

Answer №3

It appears that the variable groupUsers is not being recognized as an array. Please double-check the data type of your response.

Have you attempted to use console.log(groupUsers) within your subscribe function?

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