DRF forms - 'str' object has no attribute 'data'

Question

I'm trying to use the example found here - http://www.django-rest-framework.org/topics/html-and-forms/

I'm literally cut/pasting from the example changing it to my own model -

I'm accessing the form through the following code in my base.html -

{% include 'dashboard/widget_detail.html' %}

widget_details.html

{% load rest_framework %}

<h1>Profile - {{ widget.name }}</h1>

<form action="{% url 'widget-detail' pk=widget.pk '%}" method="POST">
    {% csrf_token %}
    {% render_form serializer %}
    <input type="submit" value="Save">
</form>

views.py

class WidgetDetail(APIView):
    renderer_classes = [TemplateHTMLRenderer]
    template_name = 'dashboard/widget_detail.html'

    def get(self, request, pk):
        widget= get_object_or_404(Widget, pk=pk)
        serializer = WidgetSerializer(widget)
        return Response({'serializer': serializer, 'widget': widget})

    def post(self, request, pk):
        widget= get_object_or_404(Widget, pk=pk)
        serializer = WidgetSerializer(widget)
        if not serializer.is_valid():
            return Response({'serializer': serializer, 'widget': widget})
        return redirect('widget-list')

When trying to load the URL for my base.html I get the following traceback -

Traceback:
File "/opt/enterpass_app/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/opt/enterpass/gui/views.py" in display_base
  37.                           context_instance=RequestContext(request))
File "/opt/enterpass_app/lib/python2.7/site-packages/django/shortcuts.py" in render_to_response
  45.             using=using)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/loader.py" in render_to_string
  115.                         template_name, context, context_instance, dirs, dictionary)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/engine.py" in render_to_string
  221.             return t.render(context_instance)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/base.py" in render
  209.                     return self._render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/base.py" in _render
  201.         return self.nodelist.render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/base.py" in render
  903.                 bit = self.render_node(node, context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/debug.py" in render_node
  79.             return node.render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  159.                 return template.render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/base.py" in render
  211.                 return self._render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/base.py" in _render
  201.         return self.nodelist.render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/base.py" in render
  903.                 bit = self.render_node(node, context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/debug.py" in render_node
  79.             return node.render(context)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  507.                         six.reraise(*exc_info)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  493.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "/opt/enterpass_app/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse
  578.     return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/opt/enterpass_app/lib/python2.7/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
  495.                              (lookup_view_s, args, kwargs, len(patterns), patterns))

Exception Type: NoReverseMatch at /dashboard/
Exception Value: Reverse for 'widget-detail' with arguments '()' and keyword arguments '{u'pk': ''}' not found. 2 pattern(s) tried: [u'api/widgets/(?P<pk>[^/.]+)\\.(?P<format>[a-z0-9]+)/?$', u'api/widgets/(?P<pk>[^/.]+)/$']

I have no idea what I'm missing/doing wrong.

I can access http://localhost/api/widgets/5 no problem (as an example)

Update - if I remove the PK value from the form -

<form action="{% url 'api:widget-detail' %}" method="POST">
    {% csrf_token %}
    {% render_form serializer %}
    <input type="submit" value="Save">
</form>

I get the following error -

'str' object has no attribute 'data'

Which makes sense because I have no data yet. All I want is a blank form using my serializer as a backend to fill out and "save". How hard is this to do?!

Including my urls.py where it's resolving from -

router = routers.DefaultRouter()
router.register(r'widgets', views.WidgetViewSet)

urlpatterns = [
    url(r'^', include(router.urls)),
]

Answer 1

The error message gives you a clue; it says that it is using an empty string as the pk parameter. This means that for some reason widget.pk is evaluating to empty.