Hi João and Torsten,
On 20/10/11 18:53, João Pedro Francese wrote:
I've just stumbled upon the same problem in my code. I have no clue on
why it happened either. Did you ever get any progress on investigating
this issue?
Regards,
Joao
On Oct 7, 12:31 pm, Torsten Bronger<bron...@physik.rwth-aachen.de>
wrote:
Hall chen!
I examine a traceback that ends with
...
File "/usr/lib/python2.6/dist-packages/django/db/models/query.py", line
351,
in get
% (self.model._meta.object_name, num, kwargs))
TypeError: 'DoesNotExist'objectisnotcallable
The error-triggering source code in query.py says
def get(self, *args, **kwargs):
"""
Performs the query and returns a singleobjectmatching the given
keyword arguments.
"""
clone = self.filter(*args, **kwargs)
if self.query.can_filter():
clone = clone.order_by()
num = len(clone)
if num == 1:
return clone._result_cache[0]
ifnotnum:
raise self.model.DoesNotExist("%s matching query doesnotexist."
% self.model._meta.object_name)
raise self.model.MultipleObjectsReturned("get() returned more than one %s
-- it returned %s! Lookup parameters were %s"
% (self.model._meta.object_name, num, kwargs))
The last line triggers the error. This is strange for two reasons:
First,DoesNotExistshould becallablefor all models. And
secondly, there is noDoesNotExistin the last line but a
MultipleObjectsReturned.
My source code that is responsible for the error is:
try:
sample = self.samples.get() # Here, the TypeError occurs
except (Sample.DoesNotExist, Sample.MultipleObjectsReturned):
pass
I've been caught out by this error before. In my case it was because I
was not catching exceptions correctly *elsewhere* in my code. In another
view, I had something like
try:
sample = self.samples.get() # Here, the TypeError occurs
except Sample.DoesNotExist, Sample.MultipleObjectsReturned:
pass
Without the parenthesis, it's equivalent to the following in Python 2.6+
except Sample.DoesNotExist as Sample.MultipleObjectsReturned:
The instance of the DoesNotExist exception overwrites
Sample.MultipleObjectsReturned!
When the same process is handles a different request later on, you get
the type error because your code is trying to call the DoesNotExist
instance which has replaced Sample.MultipleObjectsReturned.
tschüss,
Alasdair
--
Alasdair Nicol
Developer, MEMSET
mail: alasd...@memset.com
web: http://www.memset.com/
Memset Ltd., registration number 4504980. 25 Frederick Sanger Road, Guildford,
Surrey, GU2 7YD, UK.
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