Message Slug values are case-sensitive at save but case-insensitive when used in a URL

[utahguy]

The system allows you to save multiple messages with the same slug if they differ in the case. This causes the server to return a 500 error when trying to display the message.

In my case, one of our marketers entered "WELCOME" for one slug and used the default "welcome" for another, and "welCOME" for a third.

I believe the expected behavior is to mark the slug field as invalid and ask the user to fix the value before saving.

Here is the stack trace -

22:24:03.371 | WEB | [pid: 677\|app: 0\|req: 354/36877] 10.0.0.18 () {46 vars in 1180 bytes} [Wed Apr 10 17:24:03 2019] GET /newsletter/news/archive/2019/4/9/WELCOME/ => generated 27 bytes in 73 msecs (HTTP/1.0 500) 7 headers in 274 bytes (1 switches on core 0)
-- | -- | --
22:24:03.371 | WEB | (self.model._meta.object_name, num)
22:24:03.371 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/db/models/query.py", line 384, in get
22:24:03.371 | WEB | newsletter.models.MultipleObjectsReturned: get() returned more than one Submission -- it returned 3!
22:24:03.369 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/views/generic/detail.py", line 53, in get_object
22:24:03.369 | WEB | self.object = self.get_object()
22:24:03.369 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/views/generic/dates.py", line 682, in get_object
22:24:03.369 | WEB | return super(BaseDetailView, self).get_object(queryset=qs)
22:24:03.369 | WEB | obj = queryset.get()
22:24:03.368 | WEB | File "/virtualenv/lib/python3.6/site-packages/newsletter/views.py", line 155, in dispatch
22:24:03.368 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/views/generic/base.py", line 68, in view
22:24:03.368 | WEB | return handler(request, *args, **kwargs)
22:24:03.368 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/views/generic/detail.py", line 115, in get
22:24:03.368 | WEB | return self.dispatch(request, *args, **kwargs)
22:24:03.368 | WEB | response = wrapped_callback(request, *callback_args, **callback_kwargs)
22:24:03.368 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/views/generic/base.py", line 88, in dispatch
22:24:03.368 | WEB | return super(ProcessUrlDataMixin, self).dispatch(*args, **kwargs)
22:24:03.367 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
22:24:03.367 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
22:24:03.367 | WEB | response = self._get_response(request)
22:24:03.367 | WEB | response = self.process_exception_by_middleware(e, request)
22:24:03.365 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
22:24:03.365 | WEB | response = get_response(request)
22:24:03.365 | WEB | File "/virtualenv/lib/python3.6/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
22:24:03.365 | WEB | Traceback (most recent call last):
22:24:03.365 | WEB | Internal Server Error: /newsletter/news/archive/2019/4/9/WELCOME/

[woodz-]

In my experience this repo is for enthusiasts. Pull requests having coverage maintained are welcome.