How to retrieve data from firebase and show particular data? - swift

Question

I am setting a function that allows the user to retrieve data that they have store inside the database. When user types in the value of data, it checks and displays the data to user when the is information already stored in the database. How can I retrieve the data by search 'icNumber' and display all the data that under that child value?
Here’s a screenshot of what I am trying to achieve.
Lastly, here’s my code
func displayRecord() {
//guard let uid = Auth.auth().currentUser?.uid else { return }
Database.database().reference().child("Patient_Data").observeSingleEvent(of: .value) { (snapshot) in
guard let name = snapshot.value as? String else { return }
guard let icNumber = snapshot.value as? String else { return }
guard let gender = snapshot.value as? String else { return }
guard let phoneNumber = snapshot.value as? String else { return }
guard let medicationAllergic = snapshot.value as? String else { return }
guard let smokerRecord = snapshot.value as? String else { return }
self.welcomeLabel.text = "Name, \(name)"
self.welcomeLabel.text = "IC Number, \(icNumber)"
self.welcomeLabel.text = "Gender, \(gender)"
self.welcomeLabel.text = "Phone Number, \(phoneNumber)"
self.welcomeLabel.text = "Medication Allergic, \(medicationAllergic)"
self.welcomeLabel.text = "Smoker Record, \(smokerRecord)"
UIView.animate(withDuration: 0.5, animations: {
self.welcomeLabel.alpha = 1
})
}
}

Answer 1

You probably want to change your displayRecord method to take an entry id ("-Lq_y67Rndy3BLyaKA7Q") so you see only one entry at a time, instead of every patients' data in your system. Then, you need to cast your snapshot value to a dictionary that matches the types stored on your database. That is the guard let dict = snapshot.value as? [String:String] else { return } line.
func displayRecord(entryId: String) {
Database.database().reference().child("Patient_Data/\(entryId)").observeSingleEvent(of: .value) { (snapshot) in
guard let dict = snapshot.value as? [String:String] else { return }
let name = dict["name"]
let icNumber = dict["icNumber"]
let gender = dict["gender"]
let phoneNumber = dict["phoneNumber"]
let medicationAllergic = dict["medicationAllergic"]
self.welcomeLabel.text = "Name, \(name)"
self.welcomeLabel.text = "IC Number, \(icNumber)"
self.welcomeLabel.text = "Gender, \(gender)"
self.welcomeLabel.text = "Phone Number, \(phoneNumber)"
self.welcomeLabel.text = "Medication Allergic, \(medicationAllergic)"
self.welcomeLabel.text = "Smoker Record, \(smokerRecord)"
UIView.animate(withDuration: 0.5, animations: {
self.welcomeLabel.alpha = 1
})
}
}
It seems that you think that your snapshot's value will be of type String. This must be why you are casting the value as string, and to multiple properties (it makes no sense to do this, even if your snapshot value was a string).
You may also want to consider whether all of these values should be stored as Strings on your backend.