Hi all,
Is there a way to switch django's relationship building from INNER
JOIN to LEFT OUTER JOIN ?
It causes unexpected behaviour when filtering on both parent and child
tables.
For instance, let's say my models are :
class Collection(model):
name = CharField()
class Book(model):
title = CharField()
collection = ForeignKey(Collection, blank = True, null = True)
A Book may or not belong to a Collection, so some instances have a
collection foreign key set to null.
Now, if I want to get all books related to cooking (including
'Marvelous Puddings' in the collection 'Traditional british
cooking') , I would build a queryset like :
mybooks = Book.objects.filter(title__icontains =
'cooking').filter(collection__name__icontains = 'cooking')
But this won't return books which title contains 'cooking' indeed, but
don't belong to a collection ( the corresponding records won't be
picked by the INNER JOIN, whereas a LEFT OUTER JOIN would have done
the job).
So, is there any way to go around this ?
The only hack I have in mind is get the sql, replace INNER JOIN by
LEFT OUTER JOIN, but, gee, that's ugly...
Regards,
Olivier
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