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from django.conf import settings
from django.contrib.messages.storage import default_storage
from django.utils.deprecation import MiddlewareMixin
class MessageMiddleware(MiddlewareMixin):
"""
Middleware that handles temporary messages.
"""
def process_request(self, request):
request._messages = default_storage(request)
def process_response(self, request, response):
"""
Update the storage backend (i.e., save the messages).
Raise ValueError if not all messages could be stored and DEBUG is True.
"""
# A higher middleware layer may return a request which does not contain
# messages storage, so make no assumption that it will be there.
if hasattr(request, "_messages"):
unstored_messages = request._messages.update(response)
if unstored_messages and settings.DEBUG:
raise ValueError("Not all temporary messages could be stored.")
return response
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