I am a little new to DRF (and programming in general), but I have not found
a solution to what I am trying to do. I am building an API that allows the
user to specify url suffixes with format_suffix_patterns. In particular,
JSON, CSV and XML. I have added the renderes for these (in that order) to
my DEFAULT_RENDERER_CLASSES.
If I specify the suffix this works perfectly. However I anticipated that by
listing the JSONRenderer first that would be the default should no format
be specified - but this is not always the case.
>From a casual glance it seems the order the renderer is decided is:
1. if specified as a kwarg in the APIView "initial" method
2. if specified as a request parameter in the negotiation "select_renderer"
method
3. the request header in the negotiation "select_renderer" method
4. order of renderer ??? I didn't get this far
In some request headers "application/xml" is specified (for example if just
hitting the API in a chrome browser). Because I have an XmlRenderer this is
selected as default.
I am wondering what the best way to specify "Use this format" and inject it
between #2 and #3. As a pretty ugly way I did this in the
negotiation.py/select_renderer:
def select_renderer(self, request, renderers, format_suffix=None):
"""
Given a request and a list of renderers, return a two-tuple of:
(renderer, media type).
"""
# Allow URL style format override. eg. "?format=json
format_query_param = self.settings.URL_FORMAT_OVERRIDE
format = format_suffix or
request.query_params.get(format_query_param) *or
settings.DEFAULT_RESPONSE_FORMAT*
I imported my settings into the file and specified a format. I would prefer
to add this to the REST_FRAMEWORK settings but haven't figure that out
yet...and still I think this is bad/hacky solution. Is there something more
elegant out there I just haven't found?
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