Hello, I hope this is the right place to bring up the following idea, even if it's in django.contrib.contenttypes.
GenericForeignKeys currently hard-require a model to have
a ForeignKey field to the ContentType model. In a specific use-case,
we're experiencing a bit of trouble with this, because the
ContentType in our case is actually indirectly available via another
ForeignKey:
MyModel → n:1 → ParentModel → n:1 → ContentType
However, contenttypes cannot be convinced to access the extra level
of indirection and complains that MyModel.ForeignKey('ParentModel')
is not a ForeignKey('ContentType').
Despite the additional query overhead, it'd be great if instead
I could tell contenttypes that it should
either
(a) look beyond the current model for the actual content_type
attribute, e.g. content_type='myattribute.content_type',
which, if myattribute is a ForeignKey itself adds a level of
indirection but doesn't change the logic and causes
contenttypes to resolve myattribute and use the content_type
field on the result,
or
(b) avoid hard-coding the dependency on ContentType and instead
duck-type the argument, such that my parent model could expose
the necessary functionality, e.g. via proxy calls to the
ForeignKey on ContentType stored in the parent.
Does this make sense? Would it be worthwhile to start working on
a patch for this? Which of (a) or (b) would be preferred? It feels
to me that while (b) is the Pythonesque way, (a) is more Django…
Looking forward to your thoughts,
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