fix import errors

src/c3nav/editor/models/change.py

@@ -8,7 +8,6 @@ from django.db import models
 from django.db.models import Q
 from django.utils.translation import ugettext_lazy as _
 
-from c3nav.editor.models import ChangeSet
 from c3nav.editor.utils import is_created_pk
 from c3nav.editor.wrappers import ModelInstanceWrapper
 
@@ -22,7 +21,7 @@ class Change(models.Model):
         ('m2m_add', _('add many to many relation')),
         ('m2m_remove', _('add many to many relation')),
     )
-    changeset = models.ForeignKey(ChangeSet, on_delete=models.CASCADE, verbose_name=_('Change Set'))
+    changeset = models.ForeignKey('editor.ChangeSet', on_delete=models.CASCADE, verbose_name=_('Change Set'))
     author = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, on_delete=models.PROTECT, verbose_name=_('Author'))
     created = models.DateTimeField(auto_now_add=True, verbose_name=_('created'))
     action = models.CharField(max_length=16, choices=ACTIONS, verbose_name=_('action'))

src/c3nav/editor/wrappers/base.py

@@ -3,10 +3,6 @@ from functools import wraps
 from django.db import models
 from django.db.models import Manager
 
-from c3nav.editor.wrappers import ModelInstanceWrapper, ModelWrapper
-from c3nav.editor.wrappers.manager import ManagerWrapper, ManyRelatedManagerWrapper, RelatedManagerWrapper
-from c3nav.editor.wrappers.query import QuerySetWrapper
-
 
 class BaseWrapper:
     _not_wrapped = ('_changeset', '_author', '_obj', '_created_pks', '_result', '_extra', '_result_cache',
@@ -21,6 +17,8 @@ class BaseWrapper:
 
     # noinspection PyUnresolvedReferences
     def _wrap_model(self, model):
+        from c3nav.editor.wrappers.instance import ModelInstanceWrapper
+        from c3nav.editor.wrappers.model import ModelWrapper
         if isinstance(model, type) and issubclass(model, ModelInstanceWrapper):
             model = model._parent
         if isinstance(model, ModelWrapper):
@@ -31,6 +29,7 @@ class BaseWrapper:
         return ModelWrapper(self._changeset, model, self._author)
 
     def _wrap_instance(self, instance):
+        from c3nav.editor.wrappers.instance import ModelInstanceWrapper
         if isinstance(instance, ModelInstanceWrapper):
             if self._author == instance._author and self._changeset == instance._changeset:
                 return instance
@@ -39,6 +38,7 @@ class BaseWrapper:
         return self._wrap_model(type(instance)).create_wrapped_model_class()(self._changeset, instance, self._author)
 
     def _wrap_manager(self, manager):
+        from c3nav.editor.wrappers.manager import ManagerWrapper, ManyRelatedManagerWrapper, RelatedManagerWrapper
         assert isinstance(manager, Manager)
         if hasattr(manager, 'through'):
             return ManyRelatedManagerWrapper(self._changeset, manager, self._author)
@@ -47,9 +47,11 @@ class BaseWrapper:
         return ManagerWrapper(self._changeset, manager, self._author)
 
     def _wrap_queryset(self, queryset):
+        from c3nav.editor.wrappers.query import QuerySetWrapper
         return QuerySetWrapper(self._changeset, queryset, self._author)
 
     def __getattr__(self, name):
+        from c3nav.editor.wrappers.instance import ModelInstanceWrapper
         value = getattr(self._obj, name)
         if isinstance(value, Manager):
             value = self._wrap_manager(value)

src/c3nav/editor/wrappers/instance.py

@@ -3,7 +3,7 @@ from django.db.models import Field
 from django.db.models.fields.related_descriptors import ForwardManyToOneDescriptor
 
 from c3nav.editor.utils import is_created_pk
-from c3nav.editor.wrappers import BaseWrapper
+from c3nav.editor.wrappers.base import BaseWrapper
 
 
 class ModelInstanceWrapper(BaseWrapper):

src/c3nav/editor/wrappers/manager.py

@@ -1,4 +1,4 @@
-from c3nav.editor.wrappers import BaseQueryWrapper
+from c3nav.editor.wrappers.query import BaseQueryWrapper
 
 
 class ManagerWrapper(BaseQueryWrapper):

src/c3nav/editor/wrappers/model.py

@@ -4,7 +4,8 @@ from itertools import chain
 from django.utils.functional import cached_property
 
 from c3nav.editor.forms import create_editor_form
-from c3nav.editor.wrappers import BaseWrapper, ModelInstanceWrapper
+from c3nav.editor.wrappers.base import BaseWrapper
+from c3nav.editor.wrappers.instance import ModelInstanceWrapper
 
 
 class ModelWrapper(BaseWrapper):

src/c3nav/editor/wrappers/query.py

@@ -8,7 +8,7 @@ from django.db.models.fields.related_descriptors import ForwardManyToOneDescript
 from django.utils.functional import cached_property
 
 from c3nav.editor.utils import is_created_pk
-from c3nav.editor.wrappers import BaseWrapper
+from c3nav.editor.wrappers.base import BaseWrapper
 
 
 def get_queryset(func):