With GenericForeignKey functionality, it is possible to refer to arbitrary
model. Let's ay we have Like model, which is naturally may refer to many
types of data (blogposts, users, photos, comments, etc). And so it is
desireable to be able to perform such lookups:
Like.objects.prefetch_related('content_object__followers',
'content_object__people_on_photo')
where followers is the field of User model and people_on_photo the field of
Photo model.
Currently .prefetch_related will raise an error like
Cannot find field `followers` on Photo object.
because currently it is assumed that lookups are 'strict', and data for
each lookup is homogenous (stealed the word form comment in sources :).
So I think it would be nice to implement feature for non-strict lookups in
addition to #17001.
<https://code.djangoproject.com/ticket/17001>
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