more than one primary key error in django - django

Question

I have a problem with two of my models. When tying to migrate it always ends up with the error that I have more than one primary key. I have googled and tried lots of different solutions but nothing works.
models: notice the imports
from django.db.models import Model,CharField,EmailField,IntegerField,\
OneToOneField,CASCADE,DateTimeField,ForeignKey,BooleanField,\
IntegerField,SlugField
from django.core.exceptions import ValidationError
from django.utils.translation import gettext_lazy as _
from phone_field import PhoneField
from datetime import datetime
from pdb import set_trace as B
class Adress(Model):
street=CharField(default='',max_length=100)
snumb=CharField(default='',max_length=15)
town=CharField(default='',max_length=100)
postn=CharField(default='',max_length=5,validators=[postnvali])
def __str__(self):
return 'city: ' + self.town
class Meta:
ordering=('street','town')
class Person(Model):
fname=CharField(default="",max_length=100)
lname=CharField(default="",max_length=100)
mobil=PhoneField(default='9999999999')
mail=EmailField(default='contact#gmail.com')
padress=OneToOneField(Adress,on_delete=CASCADE)
def __str__(self):
return 'person: ' + self.fname
class Meta:
ordering=('fname','lname')
migration file:
# Generated by Django 3.1.4 on 2021-01-20 13:32
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
dependencies = [
('kammem', '0029_auto_20210120_1354'),
]
operations = [
migrations.AddField(
model_name='person',
name='id',
field=models.AutoField(auto_created=True,serialize=False, verbose_name='ID'),
preserve_default=False,
),
migrations.AlterField(
model_name='person',
name='padress',
field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to='kammem.adress'),
),
]

Answer 1

Try to change your migration file to this and then run migrate:
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
dependencies = [
('kammem', '0029_auto_20210120_1354'),
]
operations = [
migrations.AlterField(
model_name='person',
name='padress',
field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to='kammem.adress'),
),
]

Answer 2

ok, here is the full error traceback:
jonas#192.168.1.133 kammem $ python3 manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, contenttypes, kammem, sessions
Running migrations:
Applying kammem.0025_auto_20210120_0935...Traceback (most recent call last):
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/utils.py", line 82, in _execute
return self.cursor.execute(sql)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/sqlite3/base.py", line 411, in execute
return Database.Cursor.execute(self, query)
sqlite3.OperationalError: table "new__kammem_person" has more than one primary key
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/jonas/Dropbox/prog/web/django/kammem/manage.py", line 22, in <module>
main()
File "/home/jonas/Dropbox/prog/web/django/kammem/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/home/jonas/.local/lib/python3.9/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
utility.execute()
File "/home/jonas/.local/lib/python3.9/site-packages/django/core/management/__init__.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/jonas/.local/lib/python3.9/site-packages/django/core/management/base.py", line 330, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/jonas/.local/lib/python3.9/site-packages/django/core/management/base.py", line 371, in execute
output = self.handle(*args, **options)
File "/home/jonas/.local/lib/python3.9/site-packages/django/core/management/base.py", line 85, in wrapped
res = handle_func(*args, **kwargs)
File "/home/jonas/.local/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 243, in handle
post_migrate_state = executor.migrate(
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 227, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/migrations/migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/migrations/operations/fields.py", line 236, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/sqlite3/schema.py", line 138, in alter_field
super().alter_field(model, old_field, new_field, strict=strict)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 571, in alter_field
self._alter_field(model, old_field, new_field, old_type, new_type,
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/sqlite3/schema.py", line 360, in _alter_field
self._remake_table(model, alter_field=(old_field, new_field))
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/sqlite3/schema.py", line 280, in _remake_table
self.create_model(new_model)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 324, in create_model
self.execute(sql, params or None)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 142, in execute
cursor.execute(sql, params)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/utils.py", line 98, in execute
return super().execute(sql, params)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/utils.py", line 66, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/utils.py", line 82, in _execute
return self.cursor.execute(sql)
File "/home/jonas/.local/lib/python3.9/site-packages/django/db/backends/sqlite3/base.py", line 411, in execute
return Database.Cursor.execute(self, query)
django.db.utils.OperationalError: table "new__kammem_person" has more than one primary key

Answer 3

ok, I think I solved it by simply removing all migrationsfiles and then rerun make migrations and migrate. Still, this is a common problem according to my google searches.