Error 500 in talk detail of talks scheduled multiple times

[shoetten]

Current Behavior

Pretalx throws a HTTP 500, when trying to view the talk details of a talk, which is scheduled multiple times (via a slot_count >= 2).

See relevant logs

ERROR 2019-06-18 16:50:47,289 django.request log Internal Server Error: /event/talk/UGYTTW/
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/django/contrib/auth/mixins.py", line 83, in dispatch
    if not self.has_permission():
  File "/pretalx/src/pretalx/common/mixins/views.py", line 174, in has_permission
    result = super().has_permission()
  File "/usr/local/lib/python3.7/site-packages/rules/contrib/views.py", line 47, in has_permission
    obj = self.get_permission_object()
  File "/pretalx/src/pretalx/agenda/views/talk.py", line 90, in get_permission_object
    return self.submission
  File "/usr/local/lib/python3.7/site-packages/django_context_decorator.py", line 50, in __get__
    return self.func.__get__(instance, cls) if hasattr(self.func, '__get__') else self.func
  File "/usr/local/lib/python3.7/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/pretalx/src/pretalx/agenda/views/talk.py", line 87, in submission
    return self.get_object()
  File "/pretalx/src/pretalx/agenda/views/talk.py", line 74, in get_object
    code__iexact=self.kwargs['slug'],
  File "/usr/local/lib/python3.7/site-packages/django/db/models/query.py", line 412, in get
    (self.model._meta.object_name, num)
pretalx.submission.models.submission.Submission.MultipleObjectsReturned: get() returned more than one Submission -- it returned 2!

Expected Behavior

Pretalx shows the talk detail view.

Steps to Reproduce

1. Create a submission and allow it to be scheduled multiple times.
2. Schedule it more than once in the schedule and release a version.
3. Try to access the talk details from the public schedule.

Context

We have multiple talks that happen four days in a row, so we want to show those on 4 different days in the schedule.

Your Environment

• Version used: 1.0.2

• Environment name and version:
  python 3.7 inside a Docker Container
  MariaDB 10.3

• Operating System and version (desktop or mobile):
  Arch Linux on the Client and the python:3.7 docker base image on the server.

• Link to your instance, if in production:
  Production Instance
  But be aware, we removed the duplicated talks (and replaced them by generic ones), to that the details view works as intended again.

[rixx]

This issue is fixed in the 1.0.3 bugfix release.