So, at work I’m using Django quite a bit, and I ran into a problem where I need the database transaction to be committed, and then I need to trigger additional server-side code that will act on that data.
Putting all of this into the view function with a manually managed transaction sucks, far too much code. There’s transaction middleware, but by then your view function has returned. What to do?
Simple. I added my own middleware, and I return a new property that I tag into the HttpResponse object. Python is flexible enough to allow this hack.
MIDDLEWARE_CLASSES = ( 'teleworker.lib.middleware.MslEventMiddleware', 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.middleware.transaction.TransactionMiddleware',
So in my MslEventMiddleware, I look for a new property in the response, and if it’s present, I execute the requested command, which will happen after the TransactionMiddleware has called commit.
def process_response(self, request, response): if hasattr(response, 'mslevent'): msl.event(response.mslevent)
Simple enough. Although a real post-processing API in Django would be helpful.