Django user.save() 在列“is_superuser”上失败不能为空

Question

I am trying to update user password using this code:

from django.contrib.auth.models import User
u = User.objects.get(username='test')
u.set_password('test')
u.save()

but it falis everytime on these errors (without long messages from whole error message):

• _mysql_connector.MySQLInterfaceError: Column 'is_superuser' cannot be null
• mysql.connector.errors.IntegrityError: 1048 (23000): Column 'is_superuser' cannot be null
• django.db.utils.IntegrityError: Column 'is_superuser' cannot be null
• AttributeError: 'NoneType' object has no attribute 'strip'

I am confused because this code is from official site so error is probably somewhere between django and mysql.

Thanks for advance

---

EDIT:

Code and complete error message:

>>> from django.contrib.auth.models import User
>>> user = User.objects.create_user('jj', 'lennon@thebeatles.com', 'johnpassword')
>>> user.save()
>>> u = User.objects.get(username='jj')
>>> print(u.is_superuser)
None
>>> u.save()
Traceback (most recent call last):
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/connection_cext.py", line 395, in cmd_query
    raw_as_string=raw_as_string)
_mysql_connector.MySQLInterfaceError: Column 'is_superuser' cannot be null

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/django/base.py", line 168, in _execute_wrapper
    return method(query, args)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 266, in execute
    raw_as_string=self._raw_as_string)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/connection_cext.py", line 398, in cmd_query
    sqlstate=exc.sqlstate)
mysql.connector.errors.IntegrityError: 1048 (23000): Column 'is_superuser' cannot be null

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/backends/utils.py", line 99, in execute
    return super().execute(sql, params)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/backends/utils.py", line 67, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/backends/utils.py", line 76, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/django/base.py", line 218, in execute
    return self._execute_wrapper(self.cursor.execute, query, new_args)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/django/base.py", line 174, in _execute_wrapper
    utils.IntegrityError(err.msg), sys.exc_info()[2])
  File "home/mm/test/.env/lib/python3.7/site-packages/django/utils/six.py", line 683, in reraise
    raise value.with_traceback(tb)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/django/base.py", line 168, in _execute_wrapper
    return method(query, args)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 266, in execute
    raw_as_string=self._raw_as_string)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/connection_cext.py", line 398, in cmd_query
    sqlstate=exc.sqlstate)
django.db.utils.IntegrityError: Column 'is_superuser' cannot be null

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 606, in statement
    return self._executed.strip().decode('utf8')
AttributeError: 'NoneType' object has no attribute 'strip'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "home/mm/test/.env/lib/python3.7/site-packages/django/contrib/auth/base_user.py", line 66, in save
    super().save(*args, **kwargs)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/base.py", line 741, in save
    force_update=force_update, update_fields=update_fields)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/base.py", line 779, in save_base
    force_update, using, update_fields,
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/base.py", line 851, in _save_table
    forced_update)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/base.py", line 900, in _do_update
    return filtered._update(values) > 0
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/query.py", line 760, in _update
    return query.get_compiler(self.db).execute_sql(CURSOR)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1429, in execute_sql
    cursor = super().execute_sql(result_type)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1100, in execute_sql
    cursor.execute(sql, params)
  File "home/mm/test/.env/lib/python3.7/site-packages/django/db/backends/utils.py", line 103, in execute
    sql = self.db.ops.last_executed_query(self.cursor, sql, params)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/django/operations.py", line 127, in last_executed_query
    return force_text(cursor.statement, errors='replace')
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/django/base.py", line 230, in __getattr__
    return getattr(self.cursor, attr)
  File "home/mm/test/.env/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 608, in statement
    return self._executed.strip()
AttributeError: 'NoneType' object has no attribute 'strip'

Mysql row from auth_user :

| id | password                                                                       | last_login                 | is_superuser | username | first_name | last_name | email                 | is_staff | is_active | date_joined                |
+----+--------------------------------------------------------------------------------+----------------------------+--------------+----------+------------+-----------+-----------------------+----------+-----------+----------------------------+
| 16 | pbkdf2_sha256$150000$0gJWVPgCXeadjdfhdjslskfzurBD$yrWlrHM8foMnTm0MpDJ6yxv0/PI= | NULL                       |            0 | jj       |            |           | lennon@thebeatles.com |        0 |         1 | 2019-08-12 21:43:49.021511 |

Answer 1

So it looks like this error is beacuse of mysql engine mysql.connector.django . After installing mysqlclient using pip install mysqlclient and changing ENGINE inside settings.py to django.db.backends.mysql everything works well!

Answer 2

You can fix the bug by using 'use_pure':True in the database OPTIONS :

DATABASES = {
    'default': {
        'ENGINE': 'mysql.connector.django',
        'NAME': '<set>',
        'USER': '<set>',
        'PASSWORD': '<set>',
        'OPTIONS': {
            'use_pure':True
        },
    }
}

Thanks to Ciaran O'Sullivan, who found the workaround: https://bugs.mysql.com/bug.php?id=92001

The solution also worked for me.

PS use_pure means that mysql-connector will use pure python connection, instead of its C extension (where I believe the bug is). https://dev.mysql.com/doc/connector-python/en/connector-python-example-connecting.html

PPS The bug had appeared in version 8.0.13, which added python3.7 support: https://dev.mysql.com/doc/relnotes/connector-python/en/news-8-0-13.html