swift - Firebase数据库快照检索。

Question

I have a database structure like below. This function below prints out everything in child node

func fetchUser() {

    ref.child("Businesses").observe(.childAdded, with: { (snapshot) in

        print(snapshot)

    }, withCancel: nil)
}

But whenever I try to get the same snapshot for BusinessCategories and used the function below nothing happens. I have also tried adding .child("Banks") and still no print out and no error message.

func fetchUser() {

  ref.child("BusinessCategories").observe(.childAdded, with: { (snapshot) in

        print(snapshot)

    }, withCancel: nil)
}

What am I doing wrong ? and how can I get snapshot of BusinessCategories?

Answer 1

The code works fine. The problem was the test user was deleted from the authentication list and the app could not sign in to the database.