def _cache_get(self, obj, passive=False):
"""retrieve object from cache, if any, and merge data"""
key = self._cache_key(obj)
cached_obj = self.cache.get(key, None)
if cached_obj:
if passive:
return merge_objects(cached_obj, obj)
else:
return merge_objects(obj, cached_obj)
return obj
def cache_add(self, obj, timeout=None, passive=False):
"""store an object in the cache for later retrieval"""
# make sure object is the correct type
if not isinstance(obj, self.model):
raise TypeError("%s is not a model in this QuerySet." % obj)
# get storage key
key = self._cache_key(obj)
# retrieve already cached object, if any
cached_obj = self.cache.get(key, None)
if cached_obj:
# merge cached object into object
if passive:
obj = merge_objects(cached_obj, obj)
else:
obj = merge_objects(obj, cached_obj)
# make sure that db and cache match
obj.save()
# cache pickled object
self.cache.set(key, obj, timeout)
def lookup(self, *args, **kwargs):
args = (self.asin,) + args
bl = self.__class__.amazon.lookup(*args, **kwargs)[0]
merge_objects(self, bl)
