On Saturday 17 June 2006 10:50, Adam Hoscilo wrote:
> I would like to filter entries from a logged in user and give him/her
> the ability to edit them - it would be nice to ensure that scope by
> manager.
> As far as I know Models don't have access to request and session data
> (and I realize it's a MVC/MVT schema violation). Is there any way to
> manage that by custom managers or maybe some other nice way?
> PS django.pl coming soon :)
Personally I think that it's bad to have models access HTTP request
data, but it's not so bad to enable them to have access to
authorisation data -- this is a very common business requirement. If
you don't do it in the model itself, you'd probably need to do it in
some 'business rules' layer that wraps model access.
So I store the logged in user in threadlocal storage, using a
middleware, then access it in my models.
It looks like this:
#### myproject/middleware/threadlocals.py
try:
from threading import local
except ImportError:
# Python 2.3 compatibility
from django.utils._threading_local import local
_thread_locals = local()
def get_current_user():
return getattr(_thread_locals, 'user', None)
class ThreadLocals(object):
"""Middleware that gets various objects from the
request object and saves them in thread local storage."""
def process_request(self, request):
_thread_locals.user = getattr(request, 'user', None)
#### end
Then put ThreadLocals into your list of installed middleware, and import
the get_current_user() function from your model code. I often use this
in custom managers -- if you set the custom manager as your default
manager, this has the very nice advantage that it works for related
objects too.
Luke
--
A former CEO: "Some of you think that only half of the Board of
Directors do all the work and the rest do nothing, actually the reverse
is true." (True Quotes From Induhviduals, Scott Adams)
Luke Plant || L.Plant.98 (at) cantab.net || http://lukeplant.me.uk/
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