diff --git a/src/c3nav/editor/api.py b/src/c3nav/editor/api.py
index fe976f10..fcd46cf4 100644
--- a/src/c3nav/editor/api.py
+++ b/src/c3nav/editor/api.py
@@ -7,7 +7,7 @@ from rest_framework.response import Response
 from rest_framework.viewsets import ViewSet
 from shapely.ops import cascaded_union
 
-from c3nav.mapdata.models import Level, Space
+from c3nav.editor.models import ChangeSet
 
 
 class EditorViewSet(ViewSet):
@@ -16,7 +16,7 @@ class EditorViewSet(ViewSet):
     /geometries/ returns a list of geojson features, you have to specify ?level=<id> or ?space=<id>
     /geometrystyles/ returns styling information for all geometry types
     """
-    def _get_level_geometries(self, level: Level):
+    def _get_level_geometries(self, level):
         buildings = level.buildings.all()
         buildings_geom = cascaded_union([building.geometry for building in buildings])
         spaces = {space.id: space for space in level.spaces.all()}
@@ -44,10 +44,11 @@ class EditorViewSet(ViewSet):
         results.extend(spaces.values())
         return results
 
-    def _get_levels_pk(self, level):
+    def _get_levels_pk(self, request, level):
+        Level = request.changeset.wrap('Level')
         levels_under = ()
         levels_on_top = ()
-        lower_level = level.lower().first()
+        lower_level = level.lower(Level).first()
         primary_levels = (level,) + ((lower_level,) if lower_level else ())
         secondary_levels = Level.objects.filter(on_top_of__in=primary_levels).values_list('pk', 'on_top_of')
         if lower_level:
@@ -59,6 +60,11 @@ class EditorViewSet(ViewSet):
 
     @list_route(methods=['get'])
     def geometries(self, request, *args, **kwargs):
+        request.changeset = ChangeSet.get_for_request(request)
+
+        Level = request.changeset.wrap('Level')
+        Space = request.changeset.wrap('Space')
+
         level = request.GET.get('level')
         space = request.GET.get('space')
         if level is not None:
@@ -66,7 +72,7 @@ class EditorViewSet(ViewSet):
                 raise ValidationError('Only level or space can be specified.')
             level = get_object_or_404(Level, pk=level)
 
-            levels, levels_on_top, levels_under = self._get_levels_pk(level)
+            levels, levels_on_top, levels_under = self._get_levels_pk(request, level)
             levels = Level.objects.filter(pk__in=levels).prefetch_related('buildings', 'spaces', 'doors',
                                                                           'spaces__groups', 'spaces__holes',
                                                                           'spaces__columns')
@@ -90,7 +96,7 @@ class EditorViewSet(ViewSet):
             doors = [door for door in level.doors.all() if door.geometry.intersects(space.geometry)]
             doors_space_geom = cascaded_union([door.geometry for door in doors]+[space.geometry])
 
-            levels, levels_on_top, levels_under = self._get_levels_pk(level.primary_level)
+            levels, levels_on_top, levels_under = self._get_levels_pk(request, level.primary_level)
             other_spaces = Space.objects.filter(level__pk__in=levels).prefetch_related('groups')
             other_spaces = [s for s in other_spaces
                             if s.geometry.intersects(doors_space_geom) and s.pk != space.pk]
diff --git a/src/c3nav/editor/wrappers.py b/src/c3nav/editor/wrappers.py
index e51b89a0..0d95b155 100644
--- a/src/c3nav/editor/wrappers.py
+++ b/src/c3nav/editor/wrappers.py
@@ -1,3 +1,4 @@
+from collections import Iterable
 from django.db import models
 from django.db.models import Manager
 
@@ -34,7 +35,8 @@ class BaseWrapper:
         elif isinstance(value, type) and issubclass(value, Exception):
             pass
         elif callable(value) and name not in self._allowed_callables:
-            raise TypeError('Can not call %s.%s wrapped!' % (self._obj, name))
+            if not isinstance(self, ModelInstanceWrapper) or hasattr(models.Model, name):
+                raise TypeError('Can not call %s.%s wrapped!' % (self._obj, name))
 
         # print(self._obj, name, type(value), value)
         return value
@@ -110,6 +112,9 @@ class BaseQueryWrapper(BaseWrapper):
     def filter(self, *args, **kwargs):
         kwargs = {name: (value._obj if isinstance(value, ModelInstanceWrapper) else value)
                   for name, value in kwargs.items()}
+        kwargs = {name: ([(item._obj if isinstance(item, ModelInstanceWrapper) else item) for item in value]
+                         if isinstance(value, Iterable) else value)
+                  for name, value in kwargs.items()}
         return self._wrap_queryset(self._obj.filter(*args, **kwargs))
 
     def count(self):
@@ -118,6 +123,12 @@ class BaseQueryWrapper(BaseWrapper):
     def values_list(self, *args, flat=False):
         return self._obj.values_list(*args, flat=flat)
 
+    def first(self):
+        first = self._obj.first()
+        if first is not None:
+            first = self._wrap_instance(first)
+        return first
+
     def __iter__(self):
         return iter([instance for instance in self._obj])
 
diff --git a/src/c3nav/mapdata/models/level.py b/src/c3nav/mapdata/models/level.py
index f938c593..26c67dd4 100644
--- a/src/c3nav/mapdata/models/level.py
+++ b/src/c3nav/mapdata/models/level.py
@@ -28,14 +28,18 @@ class Level(SpecificLocation, EditorFormMixin, models.Model):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
-    def lower(self):
+    def lower(self, level_model=None):
         if self.on_top_of_id is not None:
             raise TypeError
+        if level_model is not None:
+            Level = level_model
         return Level.objects.filter(altitude__lt=self.altitude, on_top_of__isnull=True).order_by('-altitude')
 
-    def higher(self):
+    def higher(self, level_model=None):
         if self.on_top_of_id is not None:
             raise TypeError
+        if level_model is not None:
+            Level = level_model
         return Level.objects.filter(altitude__gt=self.altitude, on_top_of__isnull=True).order_by('altitude')
 
     @property