Multi-table inheritance and primary keys

[Torsten Bronger]

Hallöchen!

Is it correct that when using multi-table inheritance, I must not
set an explicit primary key in the derived model class? Currently,
I get

...
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: column "process_ptr_id" of relation "samples_deposition" already exists

while applying the initial migration and wonder whether that what I
try to achive is possible at all.

("samples" is the app name, "deposition" is the model name of the
derived model.)

Tschö,
Torsten.

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Torsten Bronger Jabber ID: torsten...@jabber.rwth-aachen.de
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[Markus Holtermann]

Hey Torsten,

It looks like you ran into the bug reported as https://code.djangoproject.com/ticket/23956 . See my comment #6 for a workaround.

/Markus

[James Schneider]

Can you provide a small example of the code? This section may also answer your question:

https://docs.djangoproject.com/en/1.7/topics/db/models/#multiple-inheritance

- James

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[Torsten Bronger]

Hallöchen!

Markus Holtermann writes:

> It looks like you ran into the bug reported as
> https://code.djangoproject.com/ticket/23956 . See my comment #6
> for a workaround.

Thank you for the pointer, this is it indeed. I commented there.

Regards,

[Markus Holtermann]

Hey folks,

Tim thankfully merged my patch and backported it to 1.7. You could check out Django's stable/1.7.x branch to see if that solves your problem.

/Markus