Django: More helpful error messages for DoesNotExist errors?

Issue

Is it possible to coax Django into giving more information for DoesNotExist errors?

For example, it would be really nice if they would include the query… Something like:

>>> Foo.objects.get(id="example_id")
...
DoesNotExist: No objects matching id="example_id" found

Solution

As @Jeeyoung proved, it’s impossible to introspect on DoesNotExist errors to get the arguments used… So I’ve written a small function which monkey patches objects.get, catching DoesNotExists and adding the query to the error:

>>> class MyModel(m.Model):
...     pass
...
>>> patch_objects_get(MyModel)
>>> MyModel.objects.get(id=3141)
Traceback (most recent call last):
...
DoesNotExist: MyModel matching {"id": 42} does not exist
>>>

The code is at https://gist.github.com/702513

Answered By – David Wolever

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