运行 django South 时导入错误
我在我的 facebook 用户和汽车评论之间添加了一个 ManyToMany 字段到 ./facebook/model.py ，这需要我插入：
from car.models import Review
我尝试运行：
./manage.py schemamigration facebook --auto
但我收到错误：
django.core.exceptions.ImproperlyConfigured: ImportError haystack: cannot import name Review
问题是，我的 facebook 应用程序与第三个无关派对干草堆模块。我尝试了一些简单的调试，发现只要我尝试导入 Review，就会出现错误。改不改模型都没关系。难道是我的“INSTALLED_APPS”的顺序？我有“汽车”，然后是“facebook”，然后是“haystack”。
I added a ManyToMany field between my facebook user and car Reviews to ./facebook/model.py which required me to insert:
from car.models import Review
I try to run:
./manage.py schemamigration facebook --auto
but i get error:
django.core.exceptions.ImproperlyConfigured: ImportError haystack: cannot import name Review
The problem is, my facebook app has nothing to do with the third party haystack module. I tried some simple debugging and found as long as i try to import Review, i get the error. It doesn't matter if I change the model or not. Could it be the order of my "INSTALLED_APPS"? I have "car" followed by "facebook" and then "haystack".
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因此，有一些关于导入工作原理的背景知识：当您运行“
from xy import z”之类的语句时，整个模块xy都会被执行，然后解释器会拉取z并将其放置在您的命名空间中。因此，您的根本问题可能与 South 或 Haystack 无关；它可能在
car.models的某个地方。这就是为什么无论您如何遇到Review的导入，您都会收到错误，并且如果您尝试从该模块导入其他任何内容，您很可能会收到该错误。检查
car.models是否存在问题 - 特别是，您可能存在循环导入（换句话说，A 从 B 导入并且 B 从 A 导入的情况）。So, a bit of background on how imports work: When you run a statement like "
from x.y import z", the entire modulex.yis executed, and then the interpreter pullszand places it in your namespace.So, your underlying problem probably has nothing to do with South or Haystack; it's probably in
car.modelssomewhere. That's why you're getting an error no matter how you come across the importing ofReview, and you'll likely get it if you try to import anything else from that module.Check
car.modelsfor problems -- in particular, you might have a circular import (in other words, a case where A imports from B and B imports from A).或者只是模型及其文件不存在于您的环境中，但确实存在于您的配置中:)
（当我忘记“git add”文件夹并且构建到暂存后出现此错误时，发生在我身上......）
Or simply the model with its files does not exist in your environment but does exist in your configuration :)
(happened to me when I forgot to "git add" a folder and after building into staging got this error...)