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Programming Error: With PhoneNumberField in Django

After pip install phone number field on global as well as in virtual env
and importing in the models.py
I am facing programming error.
Details are as follows
DB is POSTGRESQL
models.py
from django.db import models
from phonenumber_field.modelfields import PhoneNumberField
class Agent(models.Model):
agency_name = models.CharField(max_length=200)
prop_name = models.CharField(max_length=30)
agency_address = models.CharField(max_length=300)
agency_city = models.CharField(max_length=50)
agency_country = models.CharField(max_length=50)
email_address = models.EmailField(max_length=50)
contact_nu = PhoneNumberField()
def __str__(self):
return self.agency_name
admin.py
#admin.register(Agent)
class AgentAdmin(admin.ModelAdmin):
list_display = ('agency_name', 'prop_name', 'agency_address', 'agency_city', 'agency_country', 'email_address', 'contact_nu')
Error:
[07/Jun/2021 09:52:34] "GET /admin/ HTTP/1.1" 200 5546
Internal Server Error: /admin/rk003/agent/
Traceback (most recent call last):
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.UndefinedColumn: column rk003_agent.contact_nu does not exist
Error at the time of migrate is as follows
During Migration there is no error. Makemigration works fine and create models. The check also dont return any error. Just at the time of migrate below error pops up
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.UndefinedColumn: column "contact_nu" of relation "rk003_agent" does not exist
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/rishipalsingh/Projects/notes/mdndjango/rk002/manage.py", line 22, in <module>
main()
File "/Users/rishipalsingh/Projects/notes/mdndjango/rk002/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
utility.execute()
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/core/management/__init__.py", line 413, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/core/management/base.py", line 354, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/core/management/base.py", line 398, in execute
output = self.handle(*args, **options)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/core/management/base.py", line 89, in wrapped
res = handle_func(*args, **kwargs)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 244, in handle
post_migrate_state = executor.migrate(
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/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 "/Users/rishipalsingh/Projects/notes/mdndjango/venv/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 "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/migrations/executor.py", line 227, in apply_migration
state = migration.apply(state, schema_editor)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/migrations/migration.py", line 126, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/migrations/operations/fields.py", line 244, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 594, in alter_field
self._alter_field(model, old_field, new_field, old_type, new_type,
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/postgresql/schema.py", line 196, in _alter_field
super()._alter_field(
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 751, in _alter_field
self.execute(
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 145, in execute
cursor.execute(sql, params)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/utils.py", line 98, in execute
return super().execute(sql, params)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/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 "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/Users/rishipalsingh/Projects/notes/mdndjango/venv/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: column "contact_nu" of relation "rk003_agent" does not exist
Thanks

Use a CharField, easy to handle yourself and won't cause any excessive errors.

Django django.db.utils.IntegrityError: NOT NULL constraint failed: new__users_profile.location

I have the following model
class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, related_name="profile")
image = models.ImageField(default='default.jpg', upload_to='profile_pics')
location = models.CharField(default=None, max_length=5)
def __str__(self):
return f'{self.user.username} Profile'
I was testing some things out and put null=True for location. Then I changed it to default=None. After that when I tried to run makemigrations followed by migrate.
I got the following error
Full Traceback
Traceback (most recent call last):
File "C:\Users\uddin\project\trade\manage.py", line 22, in <module>
main()
File "C:\Users\uddin\project\trade\manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
utility.execute()
File "C:\Users\uddin\Envs\web\lib\site-packages\django\core\management\__init__.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\core\management\base.py", line 330, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\core\management\base.py", line 371, in execute
output = self.handle(*args, **options)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\core\management\base.py", line 85, in wrapped
res = handle_func(*args, **kwargs)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\core\management\commands\migrate.py", line 243, in handle
post_migrate_state = executor.migrate(
File "C:\Users\uddin\Envs\web\lib\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 "C:\Users\uddin\Envs\web\lib\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 "C:\Users\uddin\Envs\web\lib\site-packages\django\db\migrations\executor.py", line 227, in apply_migration
state = migration.apply(state, schema_editor)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\migrations\operations\fields.py", line 236, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\sqlite3\schema.py", line 138, in alter_field
super().alter_field(model, old_field, new_field, strict=strict)
File "C:\Users\uddin\Envs\web\lib\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 "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\sqlite3\schema.py", line 360, in _alter_field
self._remake_table(model, alter_field=(old_field, new_field))
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\sqlite3\schema.py", line 283, in _remake_table
self.execute("INSERT INTO %s (%s) SELECT %s FROM %s" % (
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\base\schema.py", line 142, in execute
cursor.execute(sql, params)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\utils.py", line 98, in execute
return super().execute(sql, params)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\utils.py", line 66, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\utils.py", line 75, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\uddin\Envs\web\lib\site-packages\django\db\backends\sqlite3\base.py", line 413, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: new__users_profile.location
I went through the migrations folder and changed each migration that had null=True to default=None, but I still seem to get the error? Anything I'm not seeing?

"Unique constrainted failed" problem when running migrations

I have been tryed to change a django model by applying and running migrations but I have been getting this error django.db.utils.IntegrityError: UNIQUE constraint failed: new__startup_home_mates.user_id How can this error be fixed? I have already investigated a lot but I have found nothing that fits my situation. I have already tried to use RenameField and AlterField directly from the migrations file and it is still not working maybe I was doing it wrong.
models.py
class Mates(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='usermates', unique=True)
users_requests = models.ManyToManyField(User, related_name="users_requests")
req_bio = models.CharField(max_length=400)
req_image = models.ImageField(upload_to='requestmates_pics', null=True, blank=True, default=False)
traceback
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\USER\Envs\startup\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
utility.execute()
File "C:\Users\USER\Envs\startup\lib\site-packages\django\core\management\__init__.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\core\management\base.py", line 328, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\core\management\base.py", line 369, in execute
output = self.handle(*args, **options)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\core\management\commands\migrate.py", line 231, in handle
post_migrate_state = executor.migrate(
File "C:\Users\USER\Envs\startup\lib\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 "C:\Users\USER\Envs\startup\lib\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 "C:\Users\USER\Envs\startup\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\migrations\operations\fields.py", line 249, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\sqlite3\schema.py", line 138, in alter_field
super().alter_field(model, old_field, new_field, strict=strict)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\base\schema.py", line 564, in alter_field
self._alter_field(model, old_field, new_field, old_type, new_type,
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\sqlite3\schema.py", line 360, in _alter_field
self._remake_table(model, alter_field=(old_field, new_field))
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\sqlite3\schema.py", line 283, in _remake_table
self.execute("INSERT INTO %s (%s) SELECT %s FROM %s" % (
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\base\schema.py", line 142, in execute
cursor.execute(sql, params)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\utils.py", line 100, in execute
return super().execute(sql, params)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\USER\Envs\startup\lib\site-packages\django\db\backends\sqlite3\base.py", line 396, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: UNIQUE constraint failed: new__startup_home_mates.user_id
If you need to see more code please let me know:)

You may added a primary key / id with your models later, but previous database does not have it.
If you add new features to models, add default='something', or null=True,blank=True as arguments. So that old database won't need the unique constraints/value

I suspect that your problem is with your OnetoOneField with unique set to True. You should change this to a ForeignKey (and don't set Unique = True). This is so that users can have more than one mate. That is if I have correctly understood your model setup and what you are trying to achieve.
Here is a good summary of the differences between OnetoOneField and ForeignKey:
What's the difference between django OneToOneField and ForeignKey?

OperationalError during django migration postgres on large tables

Sometimes during migrations in django on big tables (>50 millions rows) i receive the following error:
Traceback:
Traceback (most recent call last):
File "src/audit/manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.5/dist-packages/django/core/management/__init__.py", line 355, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.5/dist-packages/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/migration.py", line 129, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/usr/local/lib/python3.5/dist-packages/django/db/migrations/operations/fields.py", line 86, in database_forwards
field,
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/base/schema.py", line 439, in add_field
self.execute(sql)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/base/schema.py", line 120, in execute
cursor.execute(sql, params)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py", line 80, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.5/dist-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/usr/local/lib/python3.5/dist-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.OperationalError: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
Can you please give me advice - which postgres settings i should change in order to solve this issue?
I try set statement_timeout = 0, idle_in_transaction_session_timeout = 0 with no result.
Migration:
class Migration(migrations.Migration):
dependencies = [
('core', '0028_auto_'),
]
operations = [
migrations.AddField(
model_name='risk',
name='test3',
field=models.CharField(default='testme', max_length=50),
),
]
SQL:
BEGIN;
--
-- Add field test3 to risk
--
ALTER TABLE "core_risk" ADD COLUMN "test3" varchar(50) DEFAULT 'testme' NOT NULL;
ALTER TABLE "core_risk" ALTER COLUMN "test3" DROP DEFAULT;
COMMIT;

Django: duplicate key value violates unique constraint

I have a Joke model:
class Joke(models.Model):
...
date_created = models.DateTimeField(default=datetime.now, blank=True)
date_modified = models.DateTimeField(default=datetime.now, blank=True)
creator = models.OneToOneField(User, default=1)
Now, when I try to migrate the last line I get errors. Basically, I want to link a User to the Joke object, and since I already have a database, I want the default value to be 1, which is the admin user's id(I checked...). Makemigrations works just fine but when I try to migrate, I get this:
Operations to perform:
Apply all migrations: jokes_app, sessions, contenttypes, auth, taggit, default, admin
Running migrations:
Rendering model states... DONE
Applying jokes_app.0008_auto_20160723_1559...Traceback (most recent call last):
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
psycopg2.IntegrityError: duplicate key value violates unique constraint "jokes_app_joke_creator_id_key"
DETAIL: Key (creator_id)=(1) already exists.
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "./manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
utility.execute()
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/base.py", line 399, in execute
output = self.handle(*args, **options)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 200, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 92, in migrate
self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 121, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/executor.py", line 198, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/migration.py", line 123, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/migrations/operations/fields.py", line 201, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 482, in alter_field
old_db_params, new_db_params, strict)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/postgresql/schema.py", line 110, in _alter_field
new_db_params, strict,
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 644, in _alter_field
[new_default],
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/base/schema.py", line 110, in execute
cursor.execute(sql, params)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/utils.py", line 95, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/home/antoni4040/Documents/Jokes_Website/django-jokes/venv/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: duplicate key value violates unique constraint "jokes_app_joke_creator_id_key"
DETAIL: Key (creator_id)=(1) already exists.
I really don't understand what's wrong. Any ideas?

OneToOne field enforces, as it's name says, an one-to-one relationship, which in your case means that one user can be creator of one and only one joke - definitely not what you want. Use ForeignKey instead:
creator = models.ForeignKey(User, default=1, on_delete=models.SET_DEFAULT)