fixes #2447: Display disapproval counts in status bar to uploader and approvers

app/models/post_disapproval.rb

@@ -1,4 +1,6 @@
 class PostDisapproval < ActiveRecord::Base
+  DELETION_THRESHOLD = 1.month
+
   belongs_to :post
   belongs_to :user
   validates_uniqueness_of :post_id, :scope => [:user_id], :message => "have already hidden this post"
@@ -10,7 +12,7 @@ class PostDisapproval < ActiveRecord::Base
   scope :disinterest, lambda {where(:reason => ["disinterest", "legacy"])}
 
   def self.prune!
-    joins(:post).where("posts.is_pending = FALSE AND posts.is_flagged = FALSE").each do |post_disapproval|
+    PostDisapproval.joins(:post).where("posts.is_pending = FALSE AND posts.is_flagged = FALSE and post_disapprovals.created_at < ?", DELETION_THRESHOLD.ago).each do |post_disapproval|
       post_disapproval.destroy
     end
   end