diff -r 8fd40139827c -r 854a027c80ff server/python/django2/renkanmanager/migrations/0005_foreign_key_fields_datamigration.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/server/python/django2/renkanmanager/migrations/0005_foreign_key_fields_datamigration.py	Wed Apr 27 16:36:30 2016 +0200
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.1 on 2016-04-14 12:23
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def populate_foreign_keys(apps, schema_editor):
+    renkans = apps.get_model('renkanmanager', 'Renkan')
+    revisions = apps.get_model('renkanmanager', 'Revision')
+    workspaces = apps.get_model('renkanmanager', 'Workspace')
+    for renkan in renkans.objects.all():
+        current_revision_for_renkan = revisions.objects.get(revision_guid=renkan.current_revision_guid)
+        renkan.current_revision = current_revision_for_renkan
+        if renkan.source_revision_guid:
+            current_source_for_renkan = revisions.objects.get(revision_guid=renkan.source_revision_guid)
+            renkan.source_revision = current_source_for_renkan
+        if renkan.workspace_guid:
+            workspace_for_renkan = revisions.objects.get(revision_guid=renkan.workspace_guid)
+            renkan.workspace = workspace_for_renkan
+        renkan.save()
+    for revision in revisions.objects.all():
+        parent_renkan_for_revision = renkans.objects.get(renkan_guid=revision.parent_renkan_guid)
+        revision.parent_renkan = parent_renkan_for_revision
+        revision.save()
+            
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('renkanmanager', '0004_foreign_key_fields_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(populate_foreign_keys)
+    ]