Multi-level dictionaries not supported in multipart requests

[nazarewk]

rest_framework.utils.html.is_html_input() combined with rest_framework.utils.html.parse_html_dict() does not detect 3+ level dictionaries, for example.

1. Multipart representation of {'a':{'b':{'c':123}}} is QueryDict([('a.b.c',123)]), so is_html_input() properly detects nested dictionary.
2. On the second pass there is {'b.c':123} and is_html_input() does not detect the nested dictionary.

My suggestion is to either instantiate or return MultiValueDict instead of simple dict in parse_html_dict() (and possibly parse_html_list())
https://github.com/tomchristie/django-rest-framework/blob/master/rest_framework/utils/html.py

[lovelydinosaur]

Looks like a valid issue on first pass.

[lovelydinosaur]

Out of interest what's the use case here, are these HTML forms that you're including on a web site, or is this a client that just happens to be using simulated multipart nesting?

[nazarewk]

I have the file upload on 3rd level so i have to use multipart.