如何在Django中为群添加自定义权限？

# models.py
from django.db import models
from django.contrib.auth.models import Permission

class CustomPermission(Permission):
    # 添加自定义权限字段
    custom_field = models.CharField(max_length=100)

    class Meta:
        # 设置权限模型的元数据
        verbose_name = 'Custom Permission'
        verbose_name_plural = 'Custom Permissions'

# admin.py
from django.contrib import admin
from django.contrib.auth.admin import PermissionAdmin
from .models import CustomPermission

admin.site.register(CustomPermission, PermissionAdmin)

# models.py
from django.db import models
from django.contrib.auth.models import User

class Group(models.Model):
    name = models.CharField(max_length=100)
    creator = models.ForeignKey(User, on_delete=models.CASCADE)
    permissions = models.ManyToManyField(CustomPermission)

# views.py
from django.shortcuts import get_object_or_404
from django.contrib.auth.decorators import login_required
from .models import Group

@login_required
def add_permission(request, group_id, permission_id):
    group = get_object_or_404(Group, id=group_id)
    permission = get_object_or_404(CustomPermission, id=permission_id)
    group.permissions.add(permission)
    return HttpResponse('Permission added successfully.')

# views.py
from django.shortcuts import get_object_or_404
from django.contrib.auth.decorators import permission_required
from .models import Group

@permission_required('app.custom_permission_code')
def my_view(request):
    # 执行需要权限验证的操作
    return HttpResponse('Permission granted.')