- Author:
- eternicode
- Posted:
- January 26, 2011
- Language:
- Python
- Version:
- 1.2
- Score:
- 0 (after 0 ratings)
More a proof of concept than anything, this mixin addresses a perceived "shortcoming" of django forms: the inability to interact with the current request, and specifically the "current user".
Usage:
class SomeForm(forms.Form, RequestFetchingMixin):
# fields...
def __init__(self, *args, **kwargs):
if self.request:
# interact with self.request?
super(SomeForm, self).__init__(*args, **kwargs)
if self.request:
# more interaction
def clean(self):
if self.request:
# blah blah self.request.user blah
Notes:
- This reaches "into the past" to pull an existing HttpRequest object, regardless of what name it was bound to, into "the present".
- If multiple requests are found (what on earth are you doing??), the one bound to "request" (or the first one found, if that's not available) will be used.
- By default it goes up to 5 frames back before giving up, but that can obviously be changed if you think you need it.
- This won't work everywhere. self.request is guaranteed to be present, but may be None.
- Just because you have a self.request doesn't mean self.request.user will be a valid user. This is subject to all the rules that a regular view's request is subject to (because it is a regular view's request!)
- This isn't magic; it's just python.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | from django.http import HttpRequest
import inspect
class RequestFetchingMixin(object):
def __new__(cls, *args, **kwargs):
obj = object.__new__(cls, *args, **kwargs)
f = inspect.currentframe()
requests = []
request = None
backup_count = 0
while not requests and f.f_back is not None and backup_count < 5:
f = f.f_back
for var, val in f.f_locals.iteritems():
if isinstance(val, HttpRequest):
requests.append((var, val))
backup_count += 1
if not requests:
request = None
elif len(requests) == 1:
request = requests[0][1]
else:
for var, val in requests:
if var == 'request':
request = val
if request is None:
request = requests[0][1]
obj.request = request
return obj
|
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