Crash at BrowsableAPIRenderer.get_raw_data_form when a ListSerializer is used

[nstuardod]

Hi,

If I implement a Viewset using a ListSerializer (through a Serializer with many=True or using a explicit ListSerializer instance), and then implementing get_serializer() the Browsable API crashes with the following trace:

File ".../lib/python3.8/site-packages/rest_framework/renderers.py", line 724, in render
    context = self.get_context(data, accepted_media_type, renderer_context)
  File ".../lib/python3.8/site-packages/rest_framework/renderers.py", line 655, in get_context
    raw_data_post_form = self.get_raw_data_form(data, view, 'POST', request)
  File ".../lib/python3.8/site-packages/rest_framework/renderers.py", line 564, in get_raw_data_form
    for name, field in serializer.fields.items():
AttributeError: 'ListSerializer' object has no attribute 'fields'

Since ListSerializers have no fields property I had to workaround this issue by wrapping my ListSerializer inside another serializer. After implementing create() call the ListSerializer create() the ViewSet works without any issues.

Are ListSerializers intended for use in ViewSets?