Question

我正在为我的Web应用程序创建一个应用程序，当我尝试将模型迁移到MySQL数据库时，Django引发以下错误。

所有迁移之前都运行良好。我发现CarInstance id与主键（pk）绑定，该主键与我要用于int：pk />的简单URL架构不兼容，后者将是（showroom / car / 2）。

我试图通过简单的复制/粘贴将'id'变量移动到另一个类，该复制/粘贴将链接到CarInstance作为外键，类似于MDN在此处使用book＆BookInstance模型。我认为这将有助于创建一个单独的主键，但是我在这里。 :-)

urls.py

    path('', views.index, name='index'),
    path('cars/', views.CarListView.as_view(), name="cars"),
    path('car/<slug:uuid>/', views.CarDetailView.as_view(), name="car-detail"),
],

Models.py代码（省略其他代码）：

class CarInstance(models.Model):
    manufacturer = models.ForeignKey('Manufacturer', on_delete=models.SET_NULL, null=True)
    car_model = models.CharField('Model', max_length=50, null=True)
    description = models.TextField(max_length=4000)
    vin = models.CharField('VIN', max_length=17, help_text='Enter the 17 character VIN number.', blank=True, null=True)
    mileage = models.IntegerField(verbose_name='Mileage')
    car_images = models.ImageField(help_text='Upload pictures', upload_to=image_directory_path, storage=image_storage)
    date_added = models.DateField(auto_now_add=True)
    engine_displacement = models.CharField(default=2.0, max_length=3, help_text="Engine displacement in Liters (E.g. 2.0, 4.2, 6.3)")
    price = models.IntegerField(default=0)

    id = models.UUIDField(primary_key=True, default=uuid.uuid4,
    help_text="Unique ID for this car.", editable=False)

异常错误

我希望迁移能够正常进行，但是会引发此错误。我不确定断点在哪里，所以我只在此处发布了整个代码块。

C:\code\torque>py manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions, showroom
Running migrations:
  Applying showroom.0012_auto_20190930_0701...Traceback (most recent call last):
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\mysql\base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "C:\Users\USER\Envs\torque\lib\site-packages\MySQLdb\cursors.py", line 209, in execute
    res = self._query(query)
  File "C:\Users\USER\Envs\torque\lib\site-packages\MySQLdb\cursors.py", line 315, in _query
    db.query(q)
  File "C:\Users\USER\Envs\torque\lib\site-packages\MySQLdb\connections.py", line 226, in query
    _mysql.connection.query(self, query)
MySQLdb._exceptions.OperationalError: (1292, "Truncated incorrect INTEGER value: '6ec1fa4ccc0b44f5b51269ff3c831929                                                                '")

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

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\torque\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\core\management\base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\core\management\base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
    fake_initial=fake_initial,
  File "C:\Users\USER\Envs\torque\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\torque\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\torque\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
    state = migration.apply(state, schema_editor)
  File "C:\Users\USER\Envs\torque\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\torque\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\torque\lib\site-packages\django\db\backends\base\schema.py", line 535, in alter_field
    old_db_params, new_db_params, strict)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\base\schema.py", line 685, in _alter_field
    params,
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
    cursor.execute(sql, params)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\utils.py", line 99, in execute
    return super().execute(sql, params)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\utils.py", line 67, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\USER\Envs\torque\lib\site-packages\django\db\backends\mysql\base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "C:\Users\USER\Envs\torque\lib\site-packages\MySQLdb\cursors.py", line 209, in execute
    res = self._query(query)
  File "C:\Users\USER\Envs\torque\lib\site-packages\MySQLdb\cursors.py", line 315, in _query
    db.query(q)
  File "C:\Users\USER\Envs\torque\lib\site-packages\MySQLdb\connections.py", line 226, in query
    _mysql.connection.query(self, query)
django.db.utils.OperationalError: (1292, "Truncated incorrect INTEGER value: '6ec1fa4ccc0b44f5b51269ff3c831929                                                                '")

请注意，id的结尾（29）与右引号之间有很大的距离

更新：

在过去的几个小时中，我一直在努力，但仍无法进行迁移。我发现特定CarInstances的网址使用了难看的UUID（例如，showroom / cars / 6ec1fa4c-cc0b-44f5-b512-69ff3c831929）。而且，即使语法正确，并且它们链接到正确的ID，页面仍无法正常工作。他们抛出 404 找不到页面错误。

我正在尝试将slug方法合并到url中，但是由于原始问题，我无法对模型进行任何更改。

如果您需要任何其他信息，请告诉我。

Answer 1

由于此问题对于Django / Mariadb组合来说很少见，因此我将按照以下步骤解决此问题。给以后的读者。

打开MySQL客户端命令。
输入我的密码，然后更改我的数据库

MariaDB [(none)]> use torquedb

删除数据库，并创建一个新数据库。

MariaDB [torquedb]> DROP database torquedb;
Query OK, 12 rows affected (0.089 sec)

MariaDB [(none)]> CREATE database torquedb
    -> ;
Query OK, 1 row affected (0.001 sec)

MariaDB [(none)]> show tables
    -> ;
ERROR 1046 (3D000): No database selected
MariaDB [(none)]> use torquedb
Database changed

然后我重新进行迁移

(torque) C:\code\torque> py manage.py makemigrations
torque) C:\code\torque> py manage.py migrate

幸运的是，该站点正在建设中，我只有三个要测试的对象。：-）

如何在Django中修复“截断的错误INTEGER值：'UUID'”

1 个答案: