Hello,
Here is an extremely simple scenario:
class Base(models.Model):
f1 = models.CharField(max_length=64)
class A(Base):
f2 = models.CharField(max_length=64)
class B(models.Model):
f3 = models.CharField(max_length=64)
b = models.OneToOneField('A', null=False, related_name="b_obj")
If you then try and do "print A.objects.select_related('b_obj').query'
it produces
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "django\db\models\sql\query.py", line 147, in __str__
sql, params = self.get_compiler(DEFAULT_DB_ALIAS).as_sql()
File "django\db\models\sql\compiler.py", line 59, in as_sql
self.pre_sql_setup()
File "django\db\models\sql\compiler.py", line 33, in pre_sql_setup
self.fill_related_selections()
File "django\db\models\sql\compiler.py", line 616, in
fill_related_selections
chain = opts.get_base_chain(f.rel.to)
File "django\db\models\options.py", line 440, in get_base_chain
% model._meta.module_name)
TypeError: 'a' is not an ancestor of this model
Incidentally, if I try to actually evaluate the queryset it turns out,
that no queries are run at all. Is it supposed to be like that?
In plain SQL this would be an inner join from A to Base followed by a
left outer join with B. Is it possible to make it work at all?
If you don't derive A from Base, it works perfectly (creates a left
outer join from A to B).
I hope, this makes sense
Mark
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