django1.8 compatibility issues

django_select2/fields.py

@@ -24,6 +24,11 @@ from .widgets import (AutoHeavySelect2MultipleWidget,
                       HeavySelect2MultipleWidget, HeavySelect2TagWidget,
                       HeavySelect2Widget, Select2MultipleWidget, Select2Widget)
 
+try:
+    from django.forms.fields import RenameFieldMethods as UnhideableQuerysetTypeBase
+except ImportError:
+    UnhideableQuerysetTypeBase = type
+
 logger = logging.getLogger(__name__)
 
 
@@ -284,7 +289,7 @@ class ModelResultJsonMixin(object):
         return NO_ERR_RESP, has_more, res
 
 
-class UnhideableQuerysetType(type):
+class UnhideableQuerysetType(UnhideableQuerysetTypeBase):
     """
     This does some pretty nasty hacky stuff, to make sure users can
     also define ``queryset`` as class-level field variable, instead of

django_select2/models.py

@@ -9,7 +9,7 @@ from django.utils.encoding import force_text, python_2_unicode_compatible
 class KeyMap(models.Model):
     key = models.CharField(max_length=40, unique=True)
     value = models.CharField(max_length=100)
-    accessed_on = models.DateTimeField(auto_now_add=True, auto_now=True)
+    accessed_on = models.DateTimeField(auto_now=True)
 
     def __str__(self):
         return force_text("%s => %s" % (self.key, self.value))