Question

我正在尝试为Django中的模型迁移一个简单的外键关系，但这会导致一个非常奇怪且无法解决的错误。

错误：

python manage.py migrate team
Operations to perform:
  Apply all migrations: team
Running migrations:
  Applying team.0001_initial... OK
  Applying team.0002_auto_20191127_1643...Traceback (most recent call last):
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\mysql\base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\cursors.py", line 255, in execute
    self.errorhandler(self, exc, value)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\cursors.py", line 252, in execute
    res = self._query(query)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\cursors.py", line 378, in _query
    db.query(q)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\connections.py", line 280, in query
    _mysql.connection.query(self, query)
_mysql_exceptions.OperationalError: (1005, "Can't create table 'asp052mysqlpy.#sql-6ac_56' (errno: 150)")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\core\management\base.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\core\management\base.py", line 353, in execute
    output = self.handle(*args, **options)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\core\management\base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\core\management\commands\migrate.py", line 203, in handle
    fake_initial=fake_initial,
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\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\Mitch\Desktop\teamwork\teamworkapp\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\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\migrations\executor.py", line 244, in apply_migration
    state = migration.apply(state, schema_editor)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\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\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\migrations\operations\fields.py", line 216, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\base\schema.py", line 523, in alter_field
    old_db_params, new_db_params, strict)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\base\schema.py", line 744, in _alter_field
    self.execute(self._create_fk_sql(model, new_field, "_fk_%(to_table)s_%(to_column)s"))
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\base\schema.py", line 133, in execute
    cursor.execute(sql, params)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\utils.py", line 100, in execute
    return super().execute(sql, params)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\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\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\django\db\backends\mysql\base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\cursors.py", line 255, in execute
    self.errorhandler(self, exc, value)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\cursors.py", line 252, in execute
    res = self._query(query)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\cursors.py", line 378, in _query
    db.query(q)
  File "C:\Users\Mitch\Desktop\teamwork\teamworkapp\lib\site-packages\MySQLdb\connections.py", line 280, in query
    _mysql.connection.query(self, query)
django.db.utils.OperationalError: (1005, "Can't create table 'asp052mysqlpy.#sql-6ac_56' (errno: 150)")

型号：

class Tmteams(models.Model):
    teamid = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100)

    class Meta:
        db_table = 'tmteams'


class Tmteamsusers(models.Model):
    teamid = models.ForeignKey(Tmteams, on_delete=models.CASCADE, db_column='teamid')
    userid = models.ForeignKey(User, on_delete=models.CASCADE, db_column='userid')

    class Meta:
        db_table = 'tmteamsusers'
        unique_together = (('userid', 'teamid'),)

错误的迁移文件：

class Migration(migrations.Migration):

    dependencies = [
        ('team', '0001_initial'),
    ]

    operations = [
        migrations.AlterField(
            model_name='tmteamsusers',
            name='teamid',
            field=models.ForeignKey(db_column='teamid', on_delete=django.db.models.deletion.CASCADE, to='team.Tmteams'),
        ),
        migrations.AlterField(
            model_name='tmteamsusers',
            name='userid',
            field=models.ForeignKey(db_column='userid', on_delete=django.db.models.deletion.CASCADE, to='users.User'),
        ),
    ]

我正在使用以下模块和MySQL版本：的Django 2.1.5 mysqlclient 1.3.14 MySQl 5.1.7.3社区版

有人可以帮助我吗？

Answer 1

我已经找到并解决了问题。我引用的表（allmodusers）仍在使用MyISAM数据库引擎。在阅读以下文章后，我已将此表的数据库引擎更改为InnoDB：https://kinsta.com/knowledgebase/convert-myisam-to-innodb/。

Django迁移外键django.db.utils.OperationalError：（1005，“无法创建表'asp052mysqlpy。＃sql-6ac_56'（errno：150）”）错误

1 个答案: