Why doesn't my tastypie cache get called?

Question

I'm looking at the tastypie caching docs and trying to set up my own simple caching thing, but the cache doesn't seem to get called. When I visit http://localhost:8000/api/poll/?format=json, I get my tastypie generated json, but I don't get the output from the cache class.

from tastypie.resources import ModelResource
from tastypie.cache import NoCache
from .models import Poll


class JSONCache(NoCache):
    def _load(self):
        print 'loading cache'
        data_file = open(settings.TASTYPIE_JSON_CACHE, 'r')
        return json.load(data_file)

    def _save(self, data):
        print 'saving to cache'
        data_file = open(settings.TASTYPIE_JSON_CACHE, 'w')
        return json.dump(data, data_file)

    def get(self, key):
        print 'jsoncache.get'
        data = self._load()
        return data.get(key, None)

    def set(self, key, value, timeout=60):
        print 'jsoncache.set'
        data = self._load()
        data[key] = value
        self._save(data)


class PollResource(ModelResource):
    class Meta:
        queryset = Poll.objects.all()
        resource_name = 'poll'
        cache = JSONCache()

Answer 1

It seems that Tastypie doesn't automatically cache lists, tastypie.resources around line 1027:

def get_list(self, request, **kwargs):

    # ...

    # TODO: Uncached for now. Invalidation that works for everyone may be
    #       impossible.
    objects = self.obj_get_list(
        request=request, **self.remove_api_resource_names(kwargs))

    # ...

, whereas with details (around line 1050):

def get_detail(self, request, **kwargs):

   # ...

   try:
       obj = self.cached_obj_get(
           request=request, **self.remove_api_resource_names(kwargs))

   # ...

... note that in the former snippet obj_get_list is called instead of cached_obj_get_list. Perhaps overriding get_list and using cached_obj_get_list would allow you to use cache here as well?

Now you probably would get output from your class for http://localhost:8000/api/poll/<pk>/?format=json (detail view) but not for http://localhost:8000/api/poll/?format=json (list view) by default.