fixes

[redakcja.git] / apps / dvcs / models.py

diff --git a/apps/dvcs/models.py b/apps/dvcs/models.py
index 6cfda91..d7816fa 100644 (file)
--- a/apps/dvcs/models.py
+++ b/apps/dvcs/models.py
@@ -4,7 +4,7 @@ import os.path
 from django.contrib.auth.models import User
 from django.core.files.base import ContentFile
 from django.core.files.storage import FileSystemStorage
-from django.db import models
+from django.db import models, transaction
 from django.db.models.base import ModelBase
 from django.utils.translation import ugettext_lazy as _
 from mercurial import mdiff, simplemerge
@@ -51,7 +51,7 @@ class Tag(models.Model):
             Returns None for the last stage.
         """
         try:
-            return Tag.objects.filter(ordering__gt=self.ordering)[0]
+            return type(self).objects.filter(ordering__gt=self.ordering)[0]
         except IndexError:
             return None
 
@@ -307,7 +307,7 @@ class Document(models.Model):
         return self.head
 
     def history(self):
-        return self.change_set.filter(revision__gt=-1)
+        return self.change_set.all().order_by('revision')
 
     def revision(self):
         rev = self.change_set.aggregate(
@@ -319,8 +319,21 @@ class Document(models.Model):
         return self.change_set.get(revision=rev)
 
     def publishable(self):
-        changes = self.change_set.filter(publishable=True)
+        changes = self.history().filter(publishable=True)
         if changes.exists():
-            return changes.order_by('-created_at')[0]
+            return changes.order_by('-revision')[0]
         else:
             return None
+
+    @transaction.commit_on_success
+    def prepend_history(self, other):
+        """Takes over the the other document's history and prepends to own."""
+
+        assert self != other
+        other_revs = other.change_set.all().count()
+        # workaround for a non-atomic UPDATE in SQLITE
+        self.change_set.all().update(revision=0-models.F('revision'))
+        self.change_set.all().update(revision=other_revs - models.F('revision'))
+        other.change_set.all().update(tree=self)
+        assert not other.change_set.exists()
+        other.delete()