fix favcount

app/logical/post_query_builder.rb

@@ -208,6 +208,12 @@ class PostQueryBuilder
     when "score_asc"
       relation = relation.order("posts.score, posts.id DESC")
       
+    when "favcount"
+      relation = relation.order("posts.fav_count DESC, posts.id DESC")
+      
+    when "favcount_asc"
+      relation = relation.order("posts.fav_count, posts.id DESC")
+
     when "mpixels", "mpixels_desc"
       # Use "w*h/1000000", even though "w*h" would give the same result, so this can use
       # the posts_mpixels index.

app/models/post.rb

@@ -490,6 +490,7 @@ class Post < ActiveRecord::Base
     def add_favorite!(user)
       return if favorited_by?(user.id)
       append_user_to_fav_string(user.id)
+      increment!(:fav_count)
       user.add_favorite!(self)
     end
     
@@ -499,6 +500,7 @@ class Post < ActiveRecord::Base
     
     def remove_favorite!(user)
       return unless favorited_by?(user.id)
+      decrement!(:fav_count)
       delete_user_from_fav_string(user.id)
       user.remove_favorite!(self)
     end

script/fixes/003.sql

@@ -0,0 +1,2 @@
+set statement_timeout = 0;
+update posts set fav_count = (select count(*) from favorites _ where _.post_id = posts.id) where posts.created_at > '2013-02-01';