After upgrade: "Statement matching query does not exist"

[Issen007]

After upgrading the code I got a new bug.
This is happening when I type in a unknown word for the ChatterBot.

Internal Server Error: /api/chatterbot/
Traceback (most recent call last):
  File "/home/chrisp/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/chrisp/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/chrisp/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/chrisp/lib/python3.6/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/chrisp/lib/python3.6/site-packages/django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "/home/chrisp/lib/python3.6/site-packages/chatterbot/ext/django_chatterbot/views.py", line 78, in post
    response = self.chatterbot.get_response(input_data, conversation.id)
  File "/home/chrisp/lib/python3.6/site-packages/chatterbot/chatterbot.py", line 119, in get_response
    self.storage.add_to_conversation(conversation_id, statement, response)
  File "/home/chrisp/lib/python3.6/site-packages/chatterbot/storage/django_storage.py", line 176, in add_to_conversation
    first_response = Statement.objects.get(text=response.text)
  File "/home/chrisp/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/chrisp/lib/python3.6/site-packages/django/db/models/query.py", line 380, in get
    self.model._meta.object_name
chatterbot.ext.django_chatterbot.models.DoesNotExist: Statement matching query does not exist.

[gunthercox]

A line probably needs to be modified in there to create that statement. I probably missed it when I did the conversation changes for #828

[GitCMDR]

+1, affected by bug.

[GitCMDR]

Solution is to downgrade to 0.7.6 for the moment. (At least that worked for me.)

[phdggg]

Confirm this bug is still there in 0.8.1. The workaround is to stop self-learning by adding the following to Django's settings.py:
CHATTERBOT = {
#######
'read_only': True,
#######
}

[kalentang]

agree @phdggg , this bug is still in 0.8.2.

[gunthercox]

This should be fixed now that #1391 has resulted in the removal of the Conversation model.