Added the delete_orphaned_thumbs command

hypermap/aggregator/management/commands/delete_orphaned_thumbs.py

@@ -0,0 +1,20 @@
+import os
+from uuid import UUID
+
+from django.conf import settings
+from django.core.management.base import BaseCommand
+
+from hypermap.aggregator.models import Layer
+
+
+class Command(BaseCommand):
+    help = ("Delete orphaned thumbnails.")
+
+    def handle(self, *args, **options):
+        thumbs_path = os.path.join(settings.MEDIA_ROOT, 'layers')
+        for filename in os.listdir(thumbs_path):
+            if filename.endswith(".jpg"):
+                if Layer.objects.filter(thumbnail='layers/%s' % filename).count() == 0:
+                    print 'Deleting orphaned thumb %s' % filename
+                    fn = os.path.join(thumbs_path, filename)
+                    os.remove(fn)