Update link.num_comments on comment post again.

It turns out that this commit to psql takes too long, causing backlog in
the comments_tree queue.

r2/r2/lib/comment_tree.py

@@ -128,12 +128,6 @@ def add_comments_nolock(link_id, comments):
             r[cm_id] = None
 #            print "And I set %s -> None" % cm_id
 
-    # update the link's comment count and schedule it for search reindexing
-    link = Link._byID(link_id, data = True)
-    link._incr('num_comments', len(comments))
-    from r2.lib.db.queries import changed
-    changed(link)
-
     g.permacache.set(key, r)
 
     g.permacache.set(comments_key(link_id),

r2/r2/models/link.py

@@ -604,6 +604,8 @@ class Comment(Thing, Printable):
         if parent:
             c.parent_id = parent._id
 
+        link._incr('num_comments', 1)
+
         to = None
         name = 'inbox'
         if parent:
@@ -614,6 +616,8 @@ class Comment(Thing, Printable):
 
         c._commit()
 
+        changed(link, True)  # link's number of comments changed
+
         inbox_rel = None
         # only global admins can be message spammed.
         if to and (not c._spam or to.name in g.admins):