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from django.core.management.base import LabelCommand, CommandError
from django.apps import apps
from cacheops.invalidation import *
class Command(LabelCommand):
help = 'Invalidates cache for entire app, model or particular instance'
args = '(all | <app> | <app>.<model> | <app>.<model>.<pk>) +'
label = 'app or model or object'
def handle_label(self, label, **options):
if label == 'all':
self.handle_all()
else:
app_n_model = label.split('.')
if len(app_n_model) == 1:
self.handle_app(app_n_model[0])
elif len(app_n_model) == 2:
self.handle_model(*app_n_model)
elif len(app_n_model) == 3:
self.handle_obj(*app_n_model)
else:
raise CommandError('Wrong model/app name syntax: %s\n'
'Type <app_name> or <app_name>.<model_name>' % label)
def handle_all(self):
invalidate_all()
def handle_app(self, app_name):
for model in self.get_app(app_name).get_models(include_auto_created=True):
invalidate_model(model)
def handle_model(self, app_name, model_name):
invalidate_model(self.get_model(app_name, model_name))
def handle_obj(self, app_name, model_name, obj_pk):
model = self.get_model(app_name, model_name)
try:
obj = model.objects.get(pk=obj_pk)
except model.DoesNotExist:
raise CommandError('No %s.%s with pk = %s' % (app_name, model_name, obj_pk))
invalidate_obj(obj)
def get_app(self, app_name):
try:
return apps.get_app_config(app_name)
except LookupError as e:
raise CommandError(e)
def get_model(self, app_name, model_name):
try:
return apps.get_app_config(app_name).get_model(model_name)
except LookupError as e:
raise CommandError(e)
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