Support showing multiple concurrent 'news' entities

[krestenlaust]

Currently, if multiple news entries are concurrent, an error is returned when accessing the frontpage.

In case, there's no interest in implementing support for multiple news entities, then adding a warning to the admin interface when multiple news entities are overlapping, would be appropriate imo.

Traceback

Environment: Request Method: GET Request URL: http://127.0.0.1:8000/1/

Django Version: 2.2.28
Python Version: 3.6.13
Installed Applications:
['stregsystem',
'stregreport',
'kiosk',
'django_select2',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.humanize',
'debug_toolbar']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'stregsystem.middleware.CorsMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'debug_toolbar.middleware.DebugToolbarMiddleware']

Traceback:

File "C:\ProgramData\miniconda3\envs\stregsystem\lib\site-packages\django\core\handlers\exception.py" in inner
34. response = get_response(request)

File "C:\ProgramData\miniconda3\envs\stregsystem\lib\site-packages\django\core\handlers\base.py" in _get_response
115. response = self.process_exception_by_middleware(e, request)

File "C:\ProgramData\miniconda3\envs\stregsystem\lib\site-packages\django\core\handlers\base.py" in _get_response
113. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Users\kress\source\repos\stregsystemet\stregsystem\views.py" in index
77. news = __get_news()

File "C:\Users\kress\source\repos\stregsystemet\stregsystem\views.py" in __get_news
57. return News.objects.filter(stop_date__gte=timezone.now(), pub_date__lte=timezone.now()).get()

File "C:\ProgramData\miniconda3\envs\stregsystem\lib\site-packages\django\db\models\query.py" in get
412. (self.model._meta.object_name, num)

Exception Type: MultipleObjectsReturned at /1/
Exception Value: get() returned more than one News -- it returned 2!

[falkecarlsen]

this is duplicate of #346, as the solution that I imagine to concurrent news is the approach we have for kiosk; fetching a random valid entry

[krestenlaust]

Wow, I even participated in that thread without realising it was to solve this issue. (Personally, I prefer issue naming be issue/feature oriented, and let pull requests be implementation oriented e.g. respectively, what the problem is, and what the solution is)

While random is a simple solution to the problem, I don't see the problem with simply serving the news in an sequential order. As far as I understand, the reasoning for it being random in kiosk, is that there's multiple screens with kiosk-view, and it's preferable for them to display different items at once. Not my call to make though.

[krestenlaust]

Technically resolved by #347