show most common keywords first

core/lookups.py

@@ -2,6 +2,7 @@ from selectable.base import ModelLookup
 from selectable.registry import registry
 
 from django.contrib.auth.models import User
+from django.db.models import Count
 from regluit.core.models import Work, PublisherName, Edition, Subject
 
 class OwnerLookup(ModelLookup):
@@ -46,6 +47,9 @@ class EditionLookup(ModelLookup):
 class SubjectLookup(ModelLookup):
     model = Subject
     search_fields = ('name__icontains',)
+    
+    def get_query(self, request, term):
+        return super(SubjectLookup, self).get_query( request, term).annotate(Count('works')).order_by('-works__count')
 
 registry.register(OwnerLookup)
 registry.register(WorkLookup)