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Overridable foreign key fields for Proxy models

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Allow overriding foreign key fields on Proxy models.

Mostly, you won’t want to do this. However, I did have a situation where it would be useful, mainly for reducing the numbers of queries I was having to run.

You can read about it at: http://schinckel.net/2015/05/13/django-proxy-model-relations/

Usage is pretty simple:

from proxy_overrides.related import ProxyForeignKey

class ProxyModel(ParentModel):
    related = ProxyForeignKey(OtherProxyModel)

You may only override fields that exist, although in the future, it may be possible to create a relation with a different name (enabling you to keep the standard relation to the non-proxy model).

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