do not try to keep Tag and Template in a cache, it does not play well with transaction rollbacks

We should only fill a cache of models when outside of a transaction.

django_journal/managers.py

@@ -1,25 +1,12 @@
 from django.contrib.contenttypes.models import ContentType
 from django.db.models.query import QuerySet
 from django.db.models import Q
-from django.core.cache import cache
 from model_utils.managers import PassThroughManager
 
 
-JOURNAL_METADATA_CACHE_TIMEOUT = 3600
-
-
 class CachedQuerySet(QuerySet):
     def get_cached(self, **kwargs):
-        key = tuple(sorted(kwargs.iteritems()))
-        hash1 = key.__hash__()
-        hash2 = ('x', key).__hash__()
-        key = 'dj-cache-%s-%s-%s' % (self.model.__name__, hash1, hash2)
-        instance = cache.get(key)
-        if instance is not None:
-            return instance
         instance, created = self.get_or_create(**kwargs)
-        if JOURNAL_METADATA_CACHE_TIMEOUT:
-            cache.set(key, instance, JOURNAL_METADATA_CACHE_TIMEOUT)
         return instance