Django middleware and HttpRequest change

Question

I have a middleware to make some calculations/check for each incoming request. Some of view need this calculations result.

As I do not want to call the same code twice, I would like to put results to HttpRequest in middleware, so view will be able to read it.

Could you help me with right hint, how can I add an object to HttpRequest?

thanks

Answer 1

HttpRequest is a normal class, you could directly assign the object to its instance, the request, in the middleware. For example:

class MyMiddleware(object):
    def process_request(self, request):
        request.foo = 'bar'

Answer 2

You can extend HttpResponse by using so-called "monkey-patch" method. For example you can easily add or replace methods and properties into HttpResponse by calling following function from within your root __init__.py or wsgi.py or even settings.py:

def apply_http_request_patch():

    def get_property_value(request):
        # return lazily evaluated value

    from django.http import HttpRequest
    HttpRequest.some_property = property(get_property_value)