How to write data to firebase by Ionic without erasing what is already saved?

Question

My Create method is like this

create(user: User, uuid: string): Promise<void> {
return this.db.object(`/users/${uuid}`)
  .set(user)
  .catch(this.handlePromiseError);
}

And my User class is like this

export class User {

public $key: string;

constructor(
    public name: string,
    public username: string,
    public email: string,
    public photo: string
) {}

}

Only when I go to record in firebase, the id becomes undefined and when I record another data it overrides the first one and erases.

Answer 1

Try making a push():

create(user: User): Promise<void> {
return this.db.object(`/users`)
  .push(user)
  .catch(this.handlePromiseError);
}