fix clip random

pandora/clip/migrations/0003_auto_20160219_1805.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.2 on 2016-02-19 18:05
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('clip', '0002_auto_20160219_1537'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ClipRandom',
+            fields=[
+                ('id', models.BigIntegerField(primary_key=True, serialize=False)),
+                ('clip', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to='clip.Clip')),
+            ],
+        ),
+        migrations.RemoveField(
+            model_name='random',
+            name='clip',
+        ),
+        migrations.DeleteModel(
+            name='Random',
+        ),
+    ]

pandora/clip/models.py

@@ -215,7 +215,6 @@ for name in [k['id'] for k in settings.CONFIG['layers']]:
 
 Clip = type('Clip', (MetaClip,models.Model), attrs)
 
-class Random(models.Model):
-    clip = models.ForeignKey(Clip, primary_key=True)
-    random = models.BigIntegerField(db_index=True, null=True)
-
+class ClipRandom(models.Model):
+    id = models.BigIntegerField(primary_key=True)
+    clip = models.OneToOneField(Clip)

pandora/item/tasks.py

@@ -34,10 +34,17 @@ def update_random_clip_sort():
     if filter(lambda f: f['id'] == 'random', settings.CONFIG['itemKeys']):
         with transaction.atomic():
             cursor = connection.cursor()
-            cursor.execute('DROP TABLE clip_random;')
-            cursor.execute('CREATE TABLE "clip_random" AS SELECT id AS clip_id, row_number() OVER (ORDER BY random()) AS random FROM "clip_clip"')
-            cursor.execute('ALTER TABLE "clip_random" ADD UNIQUE ("clip_id")')
-            cursor.execute('CREATE INDEX "clip_random_random" ON "clip_random" ("random")')
+            for row in (
+                'DROP TABLE clip_cliprandom',
+                'CREATE TABLE "clip_cliprandom" AS SELECT id AS clip_id, row_number() OVER (ORDER BY random()) AS id FROM "clip_clip"',
+                'ALTER TABLE "clip_cliprandom" ADD UNIQUE ("clip_id")',
+                'ALTER TABLE "clip_cliprandom" ADD UNIQUE ("id")',
+                'ALTER TABLE "clip_cliprandom" ALTER COLUMN "id" SET NOT NULL',
+                'ALTER TABLE "clip_cliprandom" ALTER COLUMN "clip_id" SET NOT NULL',
+
+            ):
+                cursor.execute(row)
+
 
 @task(ignore_results=True, queue='default')
 def update_clips(public_id):