定义一个自定义post_migrate信号 [英] defining a custom post_migrate signal

问题描述

我正在为我的项目做一些重构，在那里我依靠django django.contrib.auth.models.Permission 模型。到目前为止，我使用post_save信号定义每个新用户的权限，所以在创建用户时，我使用 user.user_permissions.add（the_permission）分配他们的权限，这个工作完美。

I'm doing some kind of refactoring for my project, where I'm relying on the django django.contrib.auth.models.Permission model. So far I define the permissions for each new user using a post_save signal, so when the user is created, I assign their permissions using user.user_permissions.add(the_permission), this works perfectly.

现在我想使用 django.contrib.auth.models.Group 模型来区分

Now I want to use the django.contrib.auth.models.Group model to clasify the permissions a user should have.

这是我的代码：

from django.apps import AppConfig
from django.db.models.signals import post_migrate
from django.contrib.auth.models import Group, Permission


def create_group(name, permissions):
    group = Group.objects.create(name=name)
    [group.permissions.add(permission) for permission in permissions]


def define_company_groups(sender, **kwargs):
    permissions = [
        Permission.objects.get(codename='add_mymodel'),
        Permission.objects.get(codename='change_mymodel'),
    ]
    create_group('managers', permissions)


class MyAppConfig(AppConfig):
    name = 'players'
    verbose_name = 'The players app'

    def ready(self):
        post_migrate.connect(define_company_groups, sender=self)

在定义了这个代码之后，我希望在调用 ./ manage.py migrate 之后，应该触发这个处理程序。但是没有发生，我所得到的只是：

After define this code, I'm expecting that after call ./manage.py migrate this handler should be fired. But it doesn't happen, all I got is:

Running post-migrate handlers for application players
Adding permission 'players | mymodel | Can add mymodel'
Adding permission 'companies | company | Can change mymodel'
Adding permission 'companies | company | Can delete company'

我发现这个 https://groups.google.com/forum/#!topic/django-developers/8MdaWtJp4VQ 文章，他们说我应该在一个名为 manage.py （不包括 models.py 文件中的代码）的文件中定义我的post_migrate处理程序，但是不起作用。

I find this https://groups.google.com/forum/#!topic/django-developers/8MdaWtJp4VQ article, they say I should define my post_migrate handler inside a file named management.py (neither including the code in the models.py file), but not works.

最后，这是我的问题：我应该把这段代码放在我自定义的post_migrate信号中？

Finally, here's my question: Where should I put this code for my custom post_migrate signal?

提前感谢

推荐答案

Django docs 建议您在应用程序中连接 post_migrate 信号config的ready方法。从文档更新之前，您链接的Google群组已过期。

The Django docs recommend connecting the post_migrate signal in your app config's ready method. The Google groups post you link to is out of date, from before the docs were updated.

您还需要在 INSTALLED_APPS 设置中指定app config 。

You also need to specify the app config in your INSTALLED_APPS setting.

INSTALLED_APPS = [
    'myapp.apps.MyAppConfig',
    # ...
]

配置您的应用程序的另一种方法是使用 default_app_config 在您的应用程序的 __ init __。py 中。请参阅配置应用程序。但是另一种方式（虚线路径到AppConfig）是首选。

Another way to configure your app is to use default_app_config in __init__.py of your app. See Configuring Applications. But the other way (dotted path to AppConfig) is preferred.

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