misc: migrate dashboard/tile foreign keys (#...)

combo/apps/dashboard/migrations/0006_auto_20180108_1737.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dashboard', '0005_auto_20180107_1355'),
+        ('data', '0033_auto_20180107_1259'),
+    ]
+
+    operations = [
+        migrations.RunSQL("""
+            UPDATE dashboard_tile SET dashboard_id =
+                    (SELECT data_cellbase.id
+                       FROM data_cellbase
+                      WHERE data_cellbase.subclassid = dashboard_tile.dashboard_id
+                       AND data_cellbase.subclass = 13);"""),
+        # this assumes tile cells are always of type "configjsoncell", this is
+        # not theorically true but it's close enough to the current truth.
+        migrations.RunSQL("""
+            UPDATE dashboard_tile SET cell_pk =
+                    (SELECT data_cellbase.id
+                       FROM data_cellbase
+                      WHERE data_cellbase.subclassid = dashboard_tile.cell_pk
+                       AND data_cellbase.subclass = 2);"""),
+    ]