def get_or_create(self, _cache=False, **kwargs):
"""
A modified version of Django's get_or_create which will create a distributed
lock (using the cache backend) whenever it hits the create clause.
"""
defaults = kwargs.pop('defaults', {})
# before locking attempt to fetch the instance
try:
if _cache:
return self.get_from_cache(**kwargs), False
return self.get(**kwargs), False
except self.model.DoesNotExist:
pass
lock_key = make_key(self.model, 'lock', kwargs)
# instance not found, lets grab a lock and attempt to create it
with Lock(lock_key):
# its important we get() before create() to ensure that if
# someone beat us to creating it from the time we did our very
# first .get(), that we get the result back as we cannot
# rely on unique constraints existing
instance, created = super(BaseManager, self).get_or_create(defaults=defaults, **kwargs)
return instance, created
def get_or_create(self, _cache=False, **kwargs):
"""
A modified version of Django's get_or_create which will create a distributed
lock (using the cache backend) whenever it hits the create clause.
"""
defaults = kwargs.pop('defaults', {})
# before locking attempt to fetch the instance
try:
if _cache:
return self.get_from_cache(**kwargs), False
return self.get(**kwargs), False
except self.model.DoesNotExist:
pass
lock_key = make_key(self.model, 'lock', kwargs)
# instance not found, lets grab a lock and attempt to create it
with Lock(lock_key):
# its important we get() before create() to ensure that if
# someone beat us to creating it from the time we did our very
# first .get(), that we get the result back as we cannot
# rely on unique constraints existing
instance, created = super(BaseManager,
self).get_or_create(defaults=defaults,
**kwargs)
return instance, created
def __get_lookup_cache_key(self, **kwargs):
return make_key(self.model, 'modelcache', kwargs)
def __get_lookup_cache_key(self, **kwargs):
return make_key(self.model, 'modelcache', kwargs)
