ValueError:在 Django 中解压的值太多(预期为 2) [英] ValueError: too many values to unpack (expected 2) in Django

问题描述

我正在重新组织我的一个项目以使其更具可重用性并且通常结构更好，现在每当我运行 makemigrations 时都会收到以下错误 - 我花了半天时间试图弄清楚这是我自己解决的，但谷歌搜索结果已经用完了，我需要一些帮助.我所做的是删除我设置的自定义用户模型，以便我可以使用 Django 的内置用户模型，并且我还为我的应用程序 URL 命名了.我不想包含一堆代码，这些代码只会弄脏这篇文章，因为我希望 Traceback 有我没有看到的线索.如果您正在查看此内容并知道错误的罪魁祸首是什么，您能否就您需要查看哪些内容以提供帮助提出建议?谢谢.

I am reorganizing one of my projects to be more re-usable and just generally structured better and am now getting the error below whenever I run makemigrations - I've spent half the day trying to figure this out on my own but have run out of Google results on searches and am in need of some assistance. What I've done was remove a custom user model I had setup so I can use Django's built-in User model and I also namespaced my apps urls. I don't want to include a bunch of code yet that will do nothing but dirty up this post as I am hoping the Traceback has clues that I am not seeing. If you are looking at this and have an idea of what could be the culprit for the error, can you please advice on what you need to see to offer assistance? Thank you.

    Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/core/management/__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/core/management/base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/core/management/base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/core/management/commands/makemigrations.py", line 132, in handle
    migration_name=self.migration_name,
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/migrations/autodetector.py", line 45, in changes
    changes = self._detect_changes(convert_apps, graph)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/migrations/autodetector.py", line 128, in _detect_changes
    self.old_apps = self.from_state.concrete_apps
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/migrations/state.py", line 166, in concrete_apps
    self.apps = StateApps(self.real_apps, self.models, ignore_swappable=True)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/migrations/state.py", line 228, in __init__
    self.render_multiple(list(models.values()) + self.real_models)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/migrations/state.py", line 296, in render_multiple
    model.render(self)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/migrations/state.py", line 585, in render
    body,
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/base.py", line 158, in __new__
    new_class.add_to_class(obj_name, obj)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/base.py", line 299, in add_to_class
    value.contribute_to_class(cls, name)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/fields/related.py", line 707, in contribute_to_class
    super(ForeignObject, self).contribute_to_class(cls, name, virtual_only=virtual_only)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/fields/related.py", line 307, in contribute_to_class
    lazy_related_operation(resolve_related_class, cls, self.remote_field.model, field=self)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/fields/related.py", line 84, in lazy_related_operation
    return apps.lazy_model_operation(partial(function, **kwargs), *model_keys)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/fields/related.py", line 82, in <genexpr>
    model_keys = (make_model_tuple(m) for m in models)
  File "/Users/rooster/.virtualenvs/ddm_dev/lib/python3.5/site-packages/django/db/models/utils.py", line 13, in make_model_tuple
    app_label, model_name = model.split(".")
ValueError: too many values to unpack (expected 2)

推荐答案

此错误只会在 split() 返回超过 2 个元素时发生:

This error would only occur if split() returns more than 2 elements:

app_label, model_name = model.split(".")
ValueError: too many values to unpack (expected 2)

这意味着 app_label 或 model_name 中有一个点 (.).我的钱是前者，因为模型名称是自动生成的

This means that either app_label or model_name has a dot (.) in it. My money is on the former as model names are automatically generated

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