Because select_related() only works on ForeignKeys that are not null or blank, when you are customizing the admin, even if you set "list_select_related=True" you can still end up with way too many querys in the Admin changelist. By adding this code to your model you can decrease the queries dramatically.
I found I needed this when I was working with Django apps with a lot of legacy data and I couldn't set the ForeignKey null=False.
1 2 3 4 5 6 7 8 9 10 11 12 | class SelectRelatedManager(models.Manager):
def get_query_set(self):
return super(SelectRelatedManager, self)\
.get_query_set()\
.select_related('organization')
class SomeModel(models.Model):
...
organization = models.ForeignKey(Organization, blank=True, null=True)
....
objects = SelectRelatedManager()
|
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