Removing an attachment from the attachment object array nestled within a comment object array nested inside another object array

I am currently grappling with the challenge of removing an attachment from an array of attachments within a nested structure of comment objects. Despite several attempts, I have yet to find a solution that works effectively.

export class CommentSection{
  id: string;
  comments: CommentObject[];
}
export class CommentObject{
  id: string;
  created: Date;
  text: string;
  attachments: CommentAttachment[];
}
export class CommentAttachment{
  id: string;
  created: Date;
  filename: string;
}

In my TypeScript file, I have included a draft solution which unfortunately is not functioning as expected:

export class CommentsComponent {

  public comment: CommentObject;
  commentsArray: CommentSection;

  public deleteCommentAttachment(attachment: CommentAttachment): void {
    this.commentsArray.comments = this.commentsArray.comments.filter((c) =>
      c[this.comment.id].attachments.splice(attachment.id, 1),
    );
  }
}

Answer №1

If you prefer, you can also utilize rxjs to break the process down into more manageable steps, although it may seem excessive to some. Take a look at this example:

https://example.com/rxjs-angular-example

Answer №2

Are you looking to target attachments instead of comments? Keep in mind that `splice` operates on indexes, not custom IDs. I've substituted `filter` with `map`. Although untested, the following code should be functional :)

this.commentsArray.comments = this.commentsArray.comments.map((c) => {
    const comment = c[this.comment.id];
    const attachments = comment.attachments;
    const index = attachments.findIndex(at => at.id == attachment.id);
    attachments.splice(index, 1);
  });

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