AttributeError: type object ‘SysUsers‘ has no attribute ‘USERNAME_FIELD‘

错误描述

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E:\SweetYaya\MyProj03>python manage.py makemigrations
Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "D:\Program Files\Python36\lib\site-packages\django\core\management\__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "D:\Program Files\Python36\lib\site-packages\django\core\management\__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "D:\Program Files\Python36\lib\site-packages\django\core\management\base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "D:\Program Files\Python36\lib\site-packages\django\core\management\base.py", line 393, in execute
    self.check()
  File "D:\Program Files\Python36\lib\site-packages\django\core\management\base.py", line 423, in check
    databases=databases,
  File "D:\Program Files\Python36\lib\site-packages\django\core\checks\registry.py", line 76, in run_checks
    new_errors = check(app_configs=app_configs, databases=databases)
  File "D:\Program Files\Python36\lib\site-packages\django\contrib\auth\checks.py", line 39, in check_user_model
    if cls.USERNAME_FIELD in cls.REQUIRED_FIELDS:
AttributeError: type object 'SysUsers' has no attribute 'USERNAME_FIELD'

解决办法

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在模型定义中加入

identifier = models.CharField(max_length=40, unique=True)
USERNAME_FIELD = 'identifier'