im not able to makemigrations to my already built model after extending user model to it in django

Question

im just stuck with error while making migrations to my django project. in my project which is already 50% dveloped i use owner model to represent owner of shop and then i used user model for login and for registration purpose. so i tried to use user model in my owner model so i could utilise both model effectively with additional fields. i tried to extend user model in owner model using onetoone field. after doing that i was not able to do migrations so i deleted all migrations files but after that it was start giving this error while doing migrations:-

py manage.py makemigrations
Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\core\management\__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\core\management\base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\core\management\base.py", line 369, in execute
    output = self.handle(*args, **options)
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\core\management\base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\core\management\commands\makemigrations.py", line 87, in handle
    loader = MigrationLoader(None, ignore_no_migrations=True)
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\db\migrations\loader.py", line 49, in __init__
    self.build_graph()
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\db\migrations\loader.py", line 274, in build_graph
    raise exc
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\db\migrations\loader.py", line 248, in build_graph
    self.graph.validate_consistency()
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\db\migrations\graph.py", line 195, in validate_consistency
    [n.raise_error() for n in self.node_map.values() if isinstance(n, DummyNode)]
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\db\migrations\graph.py", line 195, in <listcomp>
    [n.raise_error() for n in self.node_map.values() if isinstance(n, DummyNode)]
  File "C:\Users\Mayur\PycharmProjects\StartUp\venv\lib\site-packages\django\db\migrations\graph.py", line 58, in raise_error
    raise NodeNotFoundError(self.error_message, self.key, origin=self.origin)
django.db.migrations.exceptions.NodeNotFoundError: Migration listings.0001_initial dependencies reference nonexistent parent node ('owners', '0001_initial')

here is my Owner Model :-

from django.db import models
from django.contrib.auth.models import User


class Owner(models.Model):
    user = models.OneToOneField(User,on_delete=models.CASCADE, default=False)
    name=models.CharField(max_length=200)
    photo=models.ImageField(upload_to='photos/%Y/%m/%d/')
    description=models.TextField(blank=True)
    phone=models.CharField(max_length=20)
    email=models.CharField(max_length=20)

    def __str__(self):
        return self.name

im hoping that will get help on this because i'm totally stuck here and also not getting how to tackle this problem.

Did you delete the database rows in the django_migrations table? — Rob Vezina, Apr 09 '20 at 13:39
no i didnt deleted any rows or data from database. what i did is only 0001 and 002 migrations file from migration folder of my django project. — Mayur Bagul, Apr 09 '20 at 14:17

score 1 · Answer 1 · answered Apr 10 '20 at 12:33

1

You are using the term "migration folder of my django project" (in a comment above), and that is wrong -- each app in your project has its own migration folder. Specifically, there is still a migration in your "listings" app, and it lists as a dependency one of the migrations you deleted.

answered Apr 10 '20 at 12:33

Shai Berger

2,963
1
20
14

yes i deleted files from owner app migration folder. in my listing app i have 0001 file under its migration folder. – Mayur Bagul Apr 10 '20 at 14:07

score 0 · Answer 2 · answered Apr 11 '20 at 07:23

after reviewing and debugging that stack trace i finally get rid of that problem. i delete the migration file 0001 from my listing app which was having relationship with Owner Model and then when i run makemigrations command it didn't given me any error or exception like i mentioned above.

im not able to makemigrations to my already built model after extending user model to it in django

2 Answers2