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from django.contrib.messages.storage.base import BaseStorage
class SessionStorage(BaseStorage):
"""
Stores messages in the session (that is, django.contrib.sessions).
"""
session_key = '_messages'
def __init__(self, request, *args, **kwargs):
assert hasattr(request, 'session'), "The session-based temporary "\
"message storage requires session middleware to be installed, "\
"and come before the message middleware in the "\
"MIDDLEWARE_CLASSES list."
super(SessionStorage, self).__init__(request, *args, **kwargs)
def _get(self, *args, **kwargs):
"""
Retrieves a list of messages from the request's session. This storage
always stores everything it is given, so return True for the
all_retrieved flag.
"""
return self.request.session.get(self.session_key), True
def _store(self, messages, response, *args, **kwargs):
"""
Stores a list of messages to the request's session.
"""
if messages:
self.request.session[self.session_key] = messages
else:
self.request.session.pop(self.session_key, None)
return []
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