SQLite objects created in a thread can only be used in that same thread with Django 2.2.2 and ipdb

Question

I updated my Django project to version 2.2.2 and now when I call to ipdb for debugging, the server tell me that error. If I go back to Django 2.2.1, the error disappears.

System check identified no issues (0 silenced).
June 06, 2019 - 08:19:36
Django version 2.2.2, using settings 'laserapp.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
> /home/lynde/public_html/laserapp/gestion/views.py(192)get_context_data()
    191         import ipdb; ipdb.set_trace()
--> 192         context = super(ResumeOrderCodeView, self).get_context_data(**kwargs)
    193         try:

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 60, in execute
    super().execute(*args, **options)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 95, in handle
    self.run(**options)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 102, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 585, in run_with_reloader
    start_django(reloader, main_func, *args, **kwargs)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 570, in start_django
    reloader.run(django_main_thread)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 288, in run
    self.run_loop()
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 294, in run_loop
    next(ticker)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 334, in tick
    for filepath, mtime in self.snapshot_files():
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 350, in snapshot_files
    for file in self.watched_files():
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 249, in watched_files
    yield from iter_all_python_module_files()
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 103, in iter_all_python_module_files
    return iter_modules_and_files(modules, frozenset(_error_files))
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/django/utils/autoreload.py", line 120, in iter_modules_and_files
    sys_file_paths.append(module.__file__)
AttributeError: module '__main__' has no attribute '__file__'

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at [email protected]

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/IPython/core/history.py", line 780, in writeout_cache
    self._writeout_input_cache(conn)
  File "/home/lynde/public_html/env/laser/lib/python3.6/site-packages/IPython/core/history.py", line 764, in _writeout_input_cache
    (self.session_number,)+line)
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread. The object was created in thread id 140030717908736 and this is thread id 140031011022656.

Can somebody know what's the problem there? I'm using django runserver in local machine, with celery and postgresql database.

Thanks!! :)

Answer 1

Try using the --reload flag to run runserver. ./manage.py runserver --noreload

It stops the server reloading on code changes but I think avoids the issue you're having.