CODEWITHSUNDEEP
iosswiftfirebaseswift3firebase-realtime-database
grabury
grabury

Reputation: 5599

How to get records from Firebase that have names that start with a certain string?

How would you query Firebase to return children with names starting with a particular string?

I am trying to use Firebase with this autocomplete textfield project.

They use NSURLSession to fetch words that start with the letters that are being typed into the textfield:

private func handleTextFieldInterfaces(){
 autocompleteTextfield.onTextChange = {[weak self] text in
  self?.fetchAutocomplete(text)
 }
}

private func fetchAutocomplete(keyword:String) {
 dataTask = NSURLSession.sharedSession().dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
 if let data = data{
  do{
   let predictions = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)
   var locations = [String]()
   for dict in predictions as! [NSDictionary]{
    locations.append(dict["description"] as! String)
   }
   dispatch_async(dispatch_get_main_queue(), { () -> Void in
    self.autocompleteTextfield.autoCompleteStrings = locations
   })
 })
 dataTask?.resume()
}

How could I do this with Firebase?

I think it's possible to use the isEqual to query exact matches but is there a starts with query?

ref = FIRDatabase.database().reference(withPath: "/locations")
exactLocations = ref.isEqual(keyword)

Upvotes: 3

Views: 2617

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 599956

You can query for strings starting with a specific substring with queryStartingAtValue and queryEndingAtValue.

ref.queryStarting(atValue: "value")
   .queryEnding(atValue: "value\\uf8ff")

See the Firebase documentation on sorting and filtering.

Also recommended:

Upvotes: 4

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