Migrations for inherited models

[anant90@…]

I have a model BankAccount which inherits from another model PaymentType as shown below:

class PaymentType(BaseModel):
	user = models.ForeignKey(StupaUser, related_name = "%(app_label)s_%(class)s_related")

class BankAccount(PaymentType):
	account_number = models.CharField(max_length=20)
	bank_name = models.CharField(max_length=40)
	nickname = models.CharField(max_length=30)
	uri = models.CharField(max_length=200, null=True) 
	is_valid = models.BooleanField(default=True)

When I try running python manage.py makemigrations <app_name>, I get "ValueError: No field called user on model BankAccount"

Here's the stack trace:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/anant/Github/django/django/core/management/__init__.py", line 397, in execute_from_command_line
    utility.execute()
  File "/Users/anant/Github/django/django/core/management/__init__.py", line 390, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/anant/Github/django/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Users/anant/Github/django/django/core/management/base.py", line 289, in execute
    output = self.handle(*args, **options)
  File "/Users/anant/Github/django/django/core/management/commands/makemigrations.py", line 52, in handle
    changes = autodetector.changes(graph=loader.graph, trim_to_apps=app_labels or None)
  File "/Users/anant/Github/django/django/db/migrations/autodetector.py", line 34, in changes
    changes = self._detect_changes()
  File "/Users/anant/Github/django/django/db/migrations/autodetector.py", line 140, in _detect_changes
    field = model_state.get_field_by_name(field_name),
  File "/Users/anant/Github/django/django/db/migrations/state.py", line 177, in get_field_by_name
    raise ValueError("No field called %s on model %s" % (name, self.name))
ValueError: No field called user on model BankAccount

Is this expected? Why can't I use migrations for inherited models?

[Tim Graham]

I'm unable to reproduce this with your given models (changing BaseModel to models.Model and the user FK django.contrib.auth.models.User to a different model).

Are you running with the latest master? (migrations is under active development)

If so, could you provide a minimal models file to reproduce?

[anant90@…]

Thanks for the quick reply. I made a new testapp with the following models.py file:

`
from django.db import models
from django.contrib.auth.models import User, UserManager

# Create your models here.
class PaymentType(models.Model):

user = models.ForeignKey(User, related_name = "%(app_label)s_%(class)s_related")

class BankAccount(PaymentType):

account_number = models.CharField(max_length=20)
bank_name = models.CharField(max_length=40)
nickname = models.CharField(max_length=30)
uri = models.CharField(max_length=200, null=True) #balanced uri
is_valid = models.BooleanField(default=True)

`

Running python manage.py makemigrations testapp gives the following output:

Traceback (most recent call last):

File "manage.py", line 10, in <module>

execute_from_command_line(sys.argv)

File "/Users/anant/Github/django/django/core/management/init.py", line 397, in execute_from_command_line

utility.execute()

File "/Users/anant/Github/django/django/core/management/init.py", line 390, in execute

self.fetch_command(subcommand).run_from_argv(self.argv)

File "/Users/anant/Github/django/django/core/management/base.py", line 242, in run_from_argv

self.execute(*args, options.dict)

File "/Users/anant/Github/django/django/core/management/base.py", line 289, in execute

output = self.handle(*args, options)

File "/Users/anant/Github/django/django/core/management/commands/makemigrations.py", line 52, in handle

changes = autodetector.changes(graph=loader.graph, trim_to_apps=app_labels or None)

File "/Users/anant/Github/django/django/db/migrations/autodetector.py", line 34, in changes

changes = self._detect_changes()

File "/Users/anant/Github/django/django/db/migrations/autodetector.py", line 140, in _detect_changes

field = model_state.get_field_by_name(field_name),

File "/Users/anant/Github/django/django/db/migrations/state.py", line 177, in get_field_by_name

raise ValueError("No field called %s on model %s" % (name, self.name))

ValueError: No field called user on model BankAccount

I pulled in the latest django version on master and used pip install -e django/ for installation. Also, I use virtualenv.

Thanks for your time. Let me know if I'm doing something wrong here.

[Tim Graham]

Using those test models, I'm able to successfully generate a migrations file so I'm not sure what's going on.

[anant90@…]

Thanks for your help. I was able to get it working with a clean django installation. Closing this issue as invalid.