Thank you Yes, it is related to the original publication because it is the same concept (order number, restaurant code, billing number..etc) Thank you Yes, it is related to the original publication because it is the same concept (order number, restaurant code, billing number..etc) What I want is when the restaurant is added to the database, a serial number is attached to it Model: View Model View

Thank you for your reply This code: Here the data is uploaded to Firebase And this is View: But when you restart the application and add a new restaurant, the counting is done again, starting from zero. I want every restaurant to have its own number