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# blog/models.py — custom permissions
class Post(models.Model):
    title  = models.CharField(max_length=200)
    body   = models.TextField()
    status = models.CharField(max_length=10, default='draft')

class Meta:
        permissions = [
            ('publish_post',  'Can publish posts'),
            ('feature_post',  'Can feature posts on the homepage'),
        ]

# blog/views.py — permission_required decorator
from django.contrib.auth.decorators import permission_required
from django.contrib.auth.mixins import PermissionRequiredMixin

@permission_required('blog.publish_post', raise_exception=True)
def publish_post(request, pk):
    post = get_object_or_404(Post, pk=pk)
    post.status = 'published'
    post.save()
    return redirect('blog:post-detail', pk=post.pk)

class PostCreateView(PermissionRequiredMixin, CreateView):
    permission_required = 'blog.add_post'
    model         = Post
    form_class    = PostForm
    template_name = 'blog/post_form.html'

# Creating groups and assigning permissions (e.g., in a management command)
from django.contrib.auth.models import Group, Permission

editors = Group.objects.get_or_create(name='Editors')[0]
publish_perm = Permission.objects.get(codename='publish_post')
editors.permissions.add(publish_perm)

# Assign user to group
user.groups.add(editors)

# Check in templates
# {% if perms.blog.publish_post %}
#     <a href="{% url 'blog:publish' pk=post.pk %}">Publish</a>
# {% endif %}