#13784: pre_save is dispatched before executing upload_to attributes on
FileFields
when using ModelForm
--------------------------------+-------------------------------------------
Reporter: peterbe | Owner: nobody
Status: new | Milestone:
Component: Forms | Version: 1.2
Keywords: ModelForm pre_save | Stage: Unreviewed
Has_patch: 0 |
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Suppose you have this code:
{{{
def callable_upload_to(instance, filename):
full_path = os.path.join(this_year(), filename)
print "PLACING", full_path
return full_path
class Foo(models.Model):
file = models.FileField(upload_to=callable_upload_to)
size = models.IntegerField(null=True)
def update_foo(sender, instance, **kwargs):
print "UPDATING", str(instance.file)
pre_save.connect(update_foo, sender=Foo)
}}}
Suppose you create one of these instances with a '''!ModelForm''' you'll
get this output on stdout:
{{{
UPDATING sample.file
PLACING 2010/sample.file
}}}
That means that you can't rely on the file path as dictated by the
upload_to callable in your pre_save signal. Especially important is that
within your {{{pre_save}}} method you can't even get to the file since it
doesn't exist.
--
Ticket URL: <http://code.djangoproject.com/ticket/13784>
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