django-hashid-field integration

[trottomv]

Hi,
I'm encountering an error in the console logs on sorting management on a model with hashid which, however, does not seem to compromise the real functioning of sorting

Internal Server Error: /admin/projects/project/adminsortable2_update/
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py", line 179, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 233, in inner
    return view(request, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/adminsortable2/admin.py", line 247, in update_order
    return HttpResponse(json.dumps(moved_items, cls=DjangoJSONEncoder), content_type='application/json;charset=UTF-8')
  File "/usr/local/lib/python3.8/json/__init__.py", line 234, in dumps
    return cls(
  File "/usr/local/lib/python3.8/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/local/lib/python3.8/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/local/lib/python3.8/site-packages/django/core/serializers/json.py", line 105, in default
    return super().default(o)
  File "/usr/local/lib/python3.8/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type Hashid is not JSON serializable

[niccolomineo]

The way this can be solved is to subclass SortableAdminMixin. The bad thing in this is we're only doing it because we need to use HashidJSONEncoder when we are returning the response. It would be much nicer to be able to override the encoder, or something along the lines of not having to redefine a whole method.

from adminsortable2.admin import SortableAdminMixin
from django.http.response import (
    HttpResponse,
    HttpResponseBadRequest,
    HttpResponseForbidden,
    HttpResponseNotAllowed,
)

class HashIdSortableAdminMixin(SortableAdminMixin):
    """A mixin enabling sorting functionalities."""

    encoder = MyEncoder

    def update_order(self, request):
        """Update items order."""
        if not request.is_ajax() or request.method != "POST":
            return HttpResponseBadRequest("Not an XMLHttpRequest")
        if request.method != "POST":
            return HttpResponseNotAllowed("Must be a POST request")
        if not self.has_change_permission(request):
            return HttpResponseForbidden("Missing permissions to perform this request")
        startorder = int(request.POST.get("startorder"))
        endorder = int(request.POST.get("endorder", 0))
        moved_items = list(self._move_item(request, startorder, endorder))
        return HttpResponse(
            json.dumps(moved_items, cls=self.encoder),
            content_type="application/json;charset=UTF-8",
        )