How should I check if a object exists before saving it?

[maylortaylor]

I am trying to get a simple user creation logic flow but can't quite seem to get the "does user exist" code to work correctly.

  String path = "users/" + String(WiFi.macAddress());
  FirebaseJson userJson;
  userJson.set("name", "New User");
  userJson.set("/createdDate/.sv", "timestamp");

  if (Firebase.get(firebaseData, path)) {
    if (Firebase.set(firebaseData, path, userJson)) {
      Serial.println("--------FB---USER CREATED .set() ----- ");
      Serial.println(firebaseData.dataPath());
      Serial.println(firebaseData.pushName());
      Serial.println(firebaseData.dataPath() + "/"+ firebaseData.pushName());

      printFirebaseResult(firebaseData);
      printFirebaseError();

      globalUser.id = firebaseData.pushName();
      globalUser.wifiName = globals.ssid;
      globalUser.timezone = globals.timeZone;
      globalUser.zipcode = weatherSettings.zipCode;

      globalUser.updateInitial = 0;

    } else {
      Serial.println(firebaseData.errorReason());
    }
  } else {
      Serial.println(firebaseData.errorReason());
  }

I am doing a Firebase.get() to see if the path exists. I thought this function returns true only if it has a 200 Response and it finds something.

I've tested this multiple times and It will continuously keep creating this user (updating that createDate variable I made). Am I doing this wrong?

I just want to create the user one time and then on boot of the ESP32, I can just check "does that user/object exist", if yes then don't create a user again.

[mobizt]

If you want to check the node path existent, please use pathExist function.

if(Firebase.pathExist(firebaseData, "path to check"))
{
  //node found
}

[maylortaylor]

I tried this but I get a compilation error. I confirmed I have version 3.8.9 of the Firebase ESP32 Client by Mobizt

error: 'class FirebaseESP32' has no member named 'pathExists'
   if (Firebase.pathExists(firebaseData, path)) {

[mobizt]

Typo in your command pathExist not pathExists. https://github.com/mobizt/Firebase-ESP32/tree/master/src#determine-whether-defined-database-path-exists-or-not