Django: How to reduce inner joins on Model inheritance?

I have several models inheriting from a base model. The fields in the base model are needed rarely, but Django keeps doing complex inner joins to retrieve those fields whenever I use any of the inherited models. How can I tell Django to avoid this ? I only need the fields in this model rarely.

Note: maybe only(..) would work(I didn't check), but I would开发者_开发技巧 need to add it in many places in the code..

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Use abstract model inheritance.

In short, setting abstract = True in the base class' meta, makes Django using abstract inheritance, meaning each derived model will contain a copy of all the fields defined in the base model.

By the way, one of the Django's maintainers, Jacob Kaplan-Moss has quite a strong opinion against concrete inheritance,

model inheritance also offers a really excellent opportunity to shoot yourself in the foot: concrete (multi-table) inheritance

and again:

I’d strongly suggest that Django users approach any use of concrete inheritance with a large dose of skepticism.

Personally, I have never had to use model inheritance at all; however, after reading that blog entry, I am quite convinced in trying to avoid concrete inheritance as much as possible.

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I'd say the only possiblity to avoid this is either making your base class abstract, or you create some custom sql queries that don't hit the 'base'-table...