Displaying values from retrieved variables that may or may not exist

[vickorian]

Question

I'm trying to create a user interface for a client to update fields in a database. Some of them may or may not be filled in and the variables won't exist when the page is created. The question i have is what's the best way to handle this? Would using a binding make more sense here? And if using a binding, would setting the variables ahead of time and then updating them on function call be best practice?

Any help would be appreciated. It's too large to run as a refreshable.

from nicegui import ui

ui.select(['Dog','Pony']).on_value_change(lambda e: query_database(e.value))

async def query_database(val):
    db_query ....
    app.storage.user['db_return'] = db_return

ama = ui.input(value=app.storage.user['db_return'])
async def print_val():
    print(ama.value)
ui.button("Print AMA", on_click=print_val)
ui.run(host="127.0.0.1")