Probable Bug: anvil.users.login_with_form crashes lately

Bug Reports
#1

What I’m trying to do:

Just trying to show the login-form:

anvil.users.login_with_form(allow_cancel=True)

I am doing this in def form_show(self, **event_args) of a form that is shown inside of a container of my main form.

This used to work without issues for years :sweat_smile:, now I suddenly get the following error:

: Object Not Found Matching Id:2
RuntimeError: This component is already added to a container, or is already inside an alert
at anvil-services/anvil/users/__init__.py, line 556
called from Verbesserungsvorschlaege, line 385

The app is still running Python 2.7. Sadly I can’t offer to clone it.

Please help!

#2

Thanks for reporting. Can you provide a little more information?

Is this sporadic or every time?
Does it happen in a minimal example? Or only in your full app?
If it does happen in a minimal example please provide a clone link to the example.
Does it happen in production or only in the ide?
Since when did you notice the issue?

#3

It seems to happen every few days at least. First time it happened - if I can trust the log search (which I can’t as described here) - was on Fri 18th Nov 2022.

It happens in production. I haven’t tried to replicate it with a minimal example yet.

It also sometimes happens when anvil.users.login_with_form(allow_cancel=True) is called from inside my main form module.

RuntimeError: This component is already added to a container, or is already inside an alert
at anvil-services/anvil/users/__init__.py, line 556
called from Nav, line 392
called from Nav, line 293
called from Nav, line 88
#4

thanks - could you provide more code snippets to show how you’re using anvil.users.login_with_form(allow_cancel=True) in context so we can try to reproduce.

Simple attempts to reproduce haven’t worked.

Have you been able to reproduce this yourself?
Or only from logging output?

edit:
Anything that gives us a reliable way to reproduce this would be handy

#5

Yeah, same here. I’ve only ever seen this in the logs, haven’t been able to reproduce it either.

For sure. Here are two instances:

  def stapel_link_click(self, set_history=True, **event_args):
    """This method is called when the link is clicked"""
    global busy
    if not busy:      
      busy = True
      self.deselect_all_links()
      self.stapel_link.role = 'selected'
      
      if self.get_user() == None:
        anvil.users.login_with_form(allow_cancel=True)

  def form_show(self, **event_args):

    # [...] Removed some irrelevant code here

    if self.get_user() == None:
      anvil.users.login_with_form(allow_cancel=True)
#6

I haven’t had this problem since the beginning of March now (at least if you trust the search function of the App Logs), so it seems to be fixed. :tada:

Edit: Just checked but the search function is still unreliable, so it might not be fixed.