Misago/misago/categories/api.py

from rest_framework import viewsets
from rest_framework.response import Response

from .serializers import CategoryWithPosterSerializer as CategorySerializer
from .utils import get_categories_tree


class CategoryViewSet(viewsets.ViewSet):
    def list(self, request):
        categories_tree = get_categories_tree(
            request.user, request.user_acl, join_posters=True
        )
        return Response(CategorySerializer(categories_tree, many=True).data)