new management command: recluster_singletons

core/management/commands/recluster_singletons.py

@@ -0,0 +1,23 @@
+"""
+a variety of errors can cause works to not get clustered by add_editions, or a new isbn can take time to get incorporated into clustering services.
+The signature of both problems is a work with only one related edition, a singleton.
+This script goes through all singleton works and attempts to add_related. 'xx' works are excluded from being source works
+"""
+
+from django.core.management.base import BaseCommand
+from django.db.models import Count
+from regluit.core import models, bookloader
+
+class Command(BaseCommand):
+    help = "add and merge editions for singleton works"
+    
+    def handle(self, **options):
+        print "Number of singleton Works with language!=xx: %s" % models.Work.objects.annotate(num_editions=Count('editions')).filter(num_editions=1).exclude(language='xx').count()
+        
+        for work in models.Work.objects.annotate(num_editions=Count('editions')).filter(num_editions=1).exclude(language='xx'):
+            #check that there's still only one edition
+            if work.editions.count() != 1:
+                continue
+            new_editions = bookloader.add_related( work.first_isbn_13() )
+            print "clustered %s editions for work %s" % (len(new_editions),work )
+        print "Updated Number of singleton Works with language!=xx: %s" % models.Work.objects.annotate(num_editions=Count('editions')).filter(num_editions=1).exclude(language='xx').count()