ORM masks exception in Python shells

[Frank Wiles]

If you have a simple model and add a field to it, creating a South migration, but neglect to run the migration querying the model returns an empty list rather than raising an exception. Properly raises DatabaseError in a template however.

Steps to reproduce:

1. Create a simple model named say TestModel with a field.
2. Populate it with some data.
3. Create initial migration.
4. fake your initial
5. Add a new field
6. Create migration or not, but in either case do not run it to alter the table
7. run TestModel.objects.all() in Python shell (also happens in IPython) and it returns []

When visiting a view that uses that same QuerySet it properly raises a DatabaseError (from a psycopg2 ProgrammingError), but not in the shell. I couldn't find any place in the backend where it's being caught and silently ignored. Attached template debug page.

[Frank Wiles]

Debug page

[Alex Gaynor]

Are you on Python 2.6.1? If so this is a known issue with that release, nothing we can do about it (the issue is not the shell, but rather it attempting to call list to generate the repr).

[Frank Wiles]

Yup running 2.6.1, was surprised when I ran into it and couldn't find a bug in it. That'd be the issue then, thanks!