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Source code for django.contrib.messages.middleware

from django.conf import settings
from django.contrib.messages.storage import default_storage
from django.utils.deprecation import MiddlewareMixin


[docs]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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