在迁移中添加 django 管理员权限：权限匹配查询不存在

Question

我想在手动编写的迁移中添加一些组并为它们分配权限，但如果我运行它在干净的数据库上，它只会在运行完成所有迁移后创建权限。

我找到了这张票：https://code.djangoproject.com/ticket/23422 但我不能在那里发表评论（我可能在表达了对 GeoDjango 文档的不满后被禁止了），所以我将在下面分享对解决方案的改进。

Answer 1

Django <= `1.9`

查看 Django 的另一个答案 1.10+

调用create_permissions就够了：

from django.contrib.auth.management import create_permissions

apps.models_module = True
create_permissions(apps, verbosity=0)
apps.models_module = None

整个迁移过程是这样的

# coding:utf-8
from django.db import migrations
from django.contrib.auth.models import Permission, Group
from django.contrib.auth.management import create_permissions
from django.contrib.contenttypes.models import ContentType
from django.conf import settings

MODERATORS_PERMISSIONS = ['change_modelname', ]


def add_permissions(apps, schema_editor):
    apps.models_module = True
    create_permissions(apps, verbosity=0)
    apps.models_module = None

    moderators_group = Group.objects.get_or_create(
        name=settings.MODERATORS_GROUP)[0]
    for codename in MODERATORS_PERMISSIONS:
        permission = Permission.objects.get(codename=codename)
        moderators_group.permissions.add(permission)


class Migration(migrations.Migration):

    dependencies = [
        ('contenttypes', '0002_remove_content_type_name'),
        ('thisappname', '0001_initial'),
    ]

    operations = [
        migrations.RunPython(add_permissions),
    ]

Answer 2

在 django 1.10 中可以使用以下代码：

from django.contrib.auth.management import create_permissions

def migrate_permissions(apps, schema_editor):
    for app_config in apps.get_app_configs():
        app_config.models_module = True
        create_permissions(app_config, apps=apps, verbosity=0)
        app_config.models_module = None

Answer 3

如果您想要可以在任何版本上运行的东西（或者在您升级后仍然可以运行的东西）：

from django.contrib.auth.management import create_permissions

version = django.VERSION
if version[0] >= 1 and django.VERSION[1] > 9:
    for app_config in apps.get_app_configs():
        app_config.models_module = True
        create_permissions(app_config, apps=apps, verbosity=0)
        app_config.models_module = None
else:
    apps.models_module = True
    create_permissions(apps, verbosity=0)
    apps.models_module = None

Answer 4

在迁移期间尝试获取权限导致 Django 出现异常（权限匹配查询不存在）。这是 Django 中的一个老问题。在 1.6 version 中，我通过 @int_ua's 片段解决了它，但在 1.11 version 中它不起作用（我不确定为什么）。

我在 1.11 version 中使用了这个解决方法：

def _assign_group_permissions(permission_codenames, apps, group_name):
    permission_list = []
    Permission = apps.get_model('auth', 'Permission')

    for permission_codename in permission_codenames:
        for permission in Permission.objects.all():
            if permission.codename == permission_codename:
                permission_list.append(permission)

    Group = apps.get_model('auth', 'Group')
    group = Group.objects.get(name=group_name)
    group.permissions.add(*permission_list)

可以遍历所有权限并按代码名选择合适的权限，而不是 Permission.objects.get(codename='your_code_name')。

Answer 5

Django 3.2

这是 Django 3.2 的版本，您可以从命令行运行：

./manage.py fix_permissions

# app_label/management/commands/fix_permissions.py

from django.contrib.auth.models import Permission
from django.contrib.auth.management import create_permissions
from django.core.management.base import BaseCommand
from django.apps import apps

class Command(BaseCommand):
    help = 'Recreate permissions from scratch'

    def handle(self, *args, **options):
        # Run this method via shell whenever any amendments in any of the tables is made

        print("Deleting existing user permissions...")
        Permission.objects.all().delete()

        for app_config in apps.get_app_configs():
            print(f"Adding user permissions for {app_config}...")
            app_config.models_module = True
            create_permissions(app_config, apps=apps, verbosity=0)
            app_config.models_module = None

        print("DONE.")

在迁移中添加 django 管理员权限：权限匹配查询不存在

Adding django admin permissions in a migration: Permission matching query does not exist

django

django-migrations

django-permissions

Django <= `1.9`

Django 3.2

在迁移中添加 django 管理员权限：权限匹配查询不存在

Adding django admin permissions in a migration: Permission matching query does not exist

django

django-migrations

django-permissions

Django <= 1.9

Django 3.2

Django <= `1.9`