Fix jrief#257 Add django-hashid-field integration

adminsortable2/admin.py

@@ -34,6 +34,7 @@
 from django.http import (
     HttpResponse, HttpResponseBadRequest,
     HttpResponseNotAllowed, HttpResponseForbidden)
+from . import encoders
 
 __all__ = ['SortableAdminMixin', 'SortableInlineAdminMixin']
 
@@ -89,6 +90,11 @@ class SortableAdminMixin(SortableAdminBase):
     BACK, FORWARD, FIRST, LAST, EXACT = range(5)
     action_form = MovePageActionForm
 
+    if encoders.HAS_HASHID:
+        encoder = encoders.HashidJSONEncoder
+    else:
+        encoder = DjangoJSONEncoder
+
     @property
     def change_list_template(self):
         opts = self.model._meta
@@ -244,7 +250,7 @@ def update_order(self, 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=DjangoJSONEncoder), content_type='application/json;charset=UTF-8')
+        return HttpResponse(json.dumps(moved_items, cls=self.encoder), content_type='application/json;charset=UTF-8')
 
     def save_model(self, request, obj, form, change):
         if not change:

adminsortable2/encoders.py

@@ -0,0 +1,14 @@
+from django.core.serializers.json import DjangoJSONEncoder
+
+try:
+    from hashid_field import Hashid
+    HAS_HASHID = True
+except ModuleNotFoundError:
+    HAS_HASHID = False
+    pass
+
+class HashidJSONEncoder(DjangoJSONEncoder):
+        def default(self, o):
+            if isinstance(o, Hashid):
+                return str(o)
+            return super().default(o)