bug 1269104: Remove TransformManager / Queryset

The TransformManager was used for Revisions for the .transform method,
which supported adding .previous_revision to the objects in a queryset.
This is no longer used, so the standard Django manager can be used
again.

kuma/wiki/managers.py

@@ -9,13 +9,6 @@
 from .constants import (ALLOWED_TAGS, ALLOWED_ATTRIBUTES, ALLOWED_PROTOCOLS,
                         ALLOWED_STYLES)
 from .content import parse as parse_content
-from .queries import TransformQuerySet
-
-
-class TransformManager(models.Manager):
-
-    def get_queryset(self):
-        return TransformQuerySet(self.model)
 
 
 class BaseDocumentManager(models.Manager):

kuma/wiki/models.py

@@ -43,7 +43,7 @@
 from .jobs import DocumentContributorsJob, DocumentNearestZoneJob
 from .managers import (DeletedDocumentManager, DocumentAdminManager,
                        DocumentManager, RevisionIPManager,
-                       TaggedDocumentManager, TransformManager)
+                       TaggedDocumentManager)
 from .signals import render_done
 from .templatetags.jinja_helpers import absolutify
 from .utils import tidy_content, get_doc_components_from_url
@@ -1692,8 +1692,6 @@ class Revision(models.Model):
     is_mindtouch_migration = models.BooleanField(default=False, db_index=True,
                                                  help_text="Did this revision come from MindTouch?")
 
-    objects = TransformManager()
-
     def get_absolute_url(self):
         """Build the absolute URL to this revision"""
         return reverse('wiki.revision',