I have two applications (ook
and eek
say) and I want to use a foreign key to a model in ook
from a model in eek
. Both are in INSTALLED_APPS
with ook
first.
In ook.models.py
, i have:
class Fubar(models.Model):
...
In eek.models.py
, I have:
class monkey(models.Model):
external = models.ForeignKey('ook.Fubar', blank=True, null=True)
...
The migration generated is:
class Migration(migrations.Migration):
dependencies = [
('eek', '0002_auto_20151029_1040'),
]
operations = [
migrations.AlterField(
model_name='monkey',
name='external',
field=models.ForeignKey(blank=True, to='ook.Fubar', null=True),
),
]
When I run the migration, I get this error:
...
1595 raise ValueError('Foreign Object from and to fields must be
the same non-zero length')
1596 if isinstance(self.rel.to, six.string_types):
-> 1597 raise ValueError('Related model %r cannot be resolved' % self.rel.to)
1598 related_fields = []
1599 for index in range(len(self.from_fields)):
ValueError: Related model u'ook.Fubar' cannot be resolved
What am I doing wrong?
Because You have ForeignKey
in operations, You must add a ook
to dependencies
:
dependencies = [
('ook', '__first__'),
('eek', '0002_auto_20151029_1040'),
]
Django migrations have two "magic" values:
__first__
- get module first migration__latest__
- get module latest migration