Question

当我尝试为我的python项目制作数据时，会出现此错误。我不知道在哪里看，因为我有5个应用程序，包含5个模型和视图！它与不同模型中具有相同名称的属性有关系吗？（我添加related_name='+'以避免冲突名称。）

我的django版本是：1.11.3

这是我尝试制作游戏时终端返回的内容：

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/user/.local/lib/python2.7/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/home/user/.local/lib/python2.7/site-packages/django/core/management/__init__.py", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/user/.local/lib/python2.7/site-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/user/.local/lib/python2.7/site-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/home/user/.local/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 150, in handle
    loader.project_state(),
  File "/home/user/.local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 323, in project_state
    return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self.unmigrated_apps))
  File "/home/user/.local/lib/python2.7/site-packages/django/db/migrations/graph.py", line 409, in make_state
    project_state = self.nodes[node].mutate_state(project_state, preserve=False)
  File "/home/user/.local/lib/python2.7/site-packages/django/db/migrations/migration.py", line 92, in mutate_state
    operation.state_forwards(self.app_label, new_state)
  File "/home/user/.local/lib/python2.7/site-packages/django/db/migrations/operations/fields.py", line 149, in state_forwards
    delay = not old_field.is_relation
AttributeError: 'NoneType' object has no attribute 'is_relation'

Answer 1

我认为您的migrate文件有问题，如果所有文件都存在并已实施，请检查它们。我认为你存在的一些迁移文件已经消失了

Answer 2

就我而言，这是由迁移问题引起的。解决此问题的最简单方法是使用django-reset-migrations重置受影响应用的迁移：https://github.com/valdergallo/django-reset-migrations

AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; is_relation＆＃39;

2 个答案: