我们已经完成了从1.11到2.2版本的Django升级，我们几乎已经完成了，但存在一个问题，当我们使用命令python manage.py makemigrations运行迁移时那么我们将得到以下错误。
但当我们遵循下面的链接时，问题就解决了。
django 2中的迁移错误；AttributeError:'；str'；对象没有属性'；解码'；
但是，我只是想知道有没有其他方法可以解决这个问题？我觉得会有库需要更新，这是导致这个问题的原因吗？
当我们按照上面链接中的建议手动添加时，它可以正常工作，但我们已经将docker集成到项目中，那么它会失败吗？
django 2.2以下版本和2.2.20以上版本不会出现同样的问题。
错误消息为：
(env4) user2@SK385 pro % python manage.py makemigrations
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 "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
utility.execute()
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/core/management/base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/core/management/base.py", line 364, in execute
output = self.handle(*args, **options)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/core/management/base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/core/management/commands/makemigrations.py", line 101, in handle
loader.check_consistent_history(connection)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/migrations/loader.py", line 283, in check_consistent_history
applied = recorder.applied_migrations()
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 73, in applied_migrations
if self.has_table():
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 56, in has_table
return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/ddtrace/contrib/django/db.py", line 65, in cursor
return DbApiTracedCursor(conn._datadog_original_cursor(), pin)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/base/base.py", line 256, in cursor
return self._cursor()
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/base/base.py", line 233, in _cursor
self.ensure_connection()
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/base/base.py", line 197, in connect
self.init_connection_state()
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 231, in init_connection_state
if self.features.is_sql_auto_is_null_enabled:
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/utils/functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/mysql/features.py", line 82, in is_sql_auto_is_null_enabled
cursor.execute('SELECT @@SQL_AUTO_IS_NULL')
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/ddtrace/contrib/dbapi/__init__.py", line 90, in execute
return self._trace_method(self.__wrapped__.execute, self._self_datadog_name, query, {}, query, *args, **kwargs)
File "/Users/user2/Desktop/env4/lib/python3.7/site-packages/ddtrace/contrib/dbapi/__init__.py", line 44, in _trace_method
return method(*args, **kwargs)
File "/Users/user2/Desktop/env4/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 "/Users/user2/Desktop/env4/lib/python3.7/site-packages/django/db/backends/mysql/operations.py", line 146, in last_executed_query
query = query.decode(errors='replace')
AttributeError: 'str' object has no attribute 'decode'
user2
我认为您遇到这个问题是因为您使用的是PyMySQL。
这个问题在ticket 30380中得到了修复，但由于Django不正式支持PyMySQL，所以没有向后移植到Django 2.2.X。
一些选项包括：
- 升级至Django 3.0.X+
- 从PyMySQL切换到mysqlclient
- 修补Django 2.2版本(请参阅此处的修复程序(