Getting current user in data bindings

Anvil Q&A
3

Data Bindings only have access to attributes of self. So if you want to access the current user, you need to create a function to expose anvil.users.get_user():

class Form1(Form1Template):
  # ...
  def get_user(self):
    return anvil.users.get_user()

Then your data binding can be

len(self.item['players']) < self.item['max_players'] and not self.get_user() in self.item['players']

I think it’s working for you in your first example because len(self.item['players']) > 1 is always True when you’re testing it. Python doesn’t evaluate parts of boolean expressions it doesn’t need to evaluate to get the result (prioritising from left to right). So anvil.users.get_user() never gets run.

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