Python Django迁移：局部变量'；字段'；分配前参考

尝试在Django中进行迁移时，我遇到以下错误。有什么能帮助我理解问题是什么以及如何解决

Traceback (most recent call last):
File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
File "/home/john/env/lib/python3.5/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
File "/home/john/env/lib/python3.5/site-packages/django/core/management/__init__.py", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/john/env/lib/python3.5/site-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
File "/home/john/env/lib/python3.5/site-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
File "/home/john/env/lib/python3.5/site-packages/django/core/management/commands/makemigrations.py", line 150, in handle
    loader.project_state(),
File "/home/john/env/lib/python3.5/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/john/env/lib/python3.5/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/john/env/lib/python3.5/site-packages/django/db/migrations/migration.py", line 92, in mutate_state
    operation.state_forwards(self.app_label, new_state)
File "/home/john/env/lib/python3.5/site-packages/django/db/migrations/operations/fields.py", line 289, in state_forwards
    delay = not field.is_relation
UnboundLocalError: local variable 'field' referenced before assignment

回溯（最近一次呼叫最后一次）：
文件“manage.py”，第10行，在
从命令行（sys.argv）执行命令
文件“/home/john/env/lib/python3.5/site packages/django/core/management/_init__.py”，第363行，从命令行执行
utility.execute（）
文件“/home/john/env/lib/python3.5/site packages/django/core/management/_init__.py”，执行中第355行
self.fetch_命令（子命令）。从_argv（self.argv）运行_
文件“/home/john/env/lib/python3.5/site-packages/django/core/management/base.py”，第283行，在运行时从
self.execute（*args，**cmd_选项）
文件“/home/john/env/lib/python3.5/site packages/django/core/management/base.py”，第330行，在execute中
输出=self.handle（*args，**选项）
文件“/home/john/env/lib/python3.5/site packages/django/core/management/commands/makemigrations.py”，第150行，在handle中
loader.project_state（），
文件“/home/john/env/lib/python3.5/site packages/django/db/migrations/loader.py”，第323行，处于项目状态
返回self.graph.make_状态（节点=节点，at_end=at_end，real_apps=列表（self.unmigrated_apps））
文件“/home/john/env/lib/python3.5/site packages/django/db/migrations/graph.py”，第409行，处于make_状态
项目状态=self.nodes[node]。变异状态（项目状态，保留=False）
文件“/home/john/env/lib/python3.5/site packages/django/db/migrations/migration.py”，第92行，处于mutate_状态
操作。状态\u转发（self.app\u标签，新状态）
文件“/home/john/env/lib/python3.5/site packages/django/db/migrations/operations/fields.py”，第289行，状态为
延迟=非字段。是_关系
UnboundLocalError:赋值前引用的局部变量“field”

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我使用的是Django 1.11.1和Python 3.5。

您使用的是哪个Django版本？刚刚添加了问题的版本：Django 1.11.1paste views.py代码片段？？我认为这更多是您的模型的问题。但是，这似乎也是Django本身的问题。在git repo的当前master中，

state_forwards

方法与

1.11.x

分支相比进行了大量重构。降级到1.10.7为我解决了这个问题。