userlist queries now only look at first 100 works

core/userlists.py

@@ -28,11 +28,11 @@ def work_list_users(work_list, how_many):
     """return up to how_many users with one of the works on work_list in their wishlist"""
     #users = User.objects.filter(wishlist__works__in=work_list).distinct().reverse()
     # for MySQL, avoiding a nested query is more efficient: https://docs.djangoproject.com/en/dev/ref/models/querysets/#in
-    users = User.objects.filter(wishlist__works__in=list(work_list)).distinct().reverse()
+    users = User.objects.filter(wishlist__works__in=list(work_list[:100])).distinct().reverse()
     return users.all()[0:how_many]
 
 def campaign_list_users(campaign_list, how_many):
-    users = User.objects.filter(wishlist__works__campaigns__in=list(campaign_list)).distinct().reverse()
+    users = User.objects.filter(wishlist__works__campaigns__in=list(campaign_list[:100])).distinct().reverse()
     count = users.count()
     if count <= how_many :
         user_list = users[0: count]

frontend/views.py

@@ -68,7 +68,6 @@ def home(request):
     # on the preview site there are no active campaigns, so we should show most-wished books instead
     is_preview = settings.IS_PREVIEW
     if is_preview:
-        # django related fields and distinct() interact poorly, so we need to do a song and dance to get distinct works
         worklist = models.Work.objects.order_by('-num_wishes')
         works = worklist[:6]
         works2 = worklist[6:12]