如何快速从Firebase实时数据中获取特定值的数据？

Question

Taking the above picture into accord. I want to Fetch data according to the email. For instance i want to fetch key and value if value is "abc@gmail,com". how can i do that?

Answer 1

    ref.child("POSTBY").queryEqualToValue("abc@gmail.com").observe(.value) { snapshot in
  for child in snapshot.children {
    ...
  }
}

ref here is the variable that holds firebase database instance.

Answer 2

queryEqualToValue is changed. By queryEqual

ref.child("POSTBY").queryEqual(toValue: regex.encodeEmails(email).observe(.value) { snapshot in
            for child in snapshot.children {

            }
        }