fixes #2133

app/models/post_disapproval.rb

@@ -2,6 +2,7 @@ class PostDisapproval < ActiveRecord::Base
   belongs_to :post
   belongs_to :user
   validates_uniqueness_of :post_id, :scope => [:user_id], :message => "have already hidden this post"
+  attr_accessible :post_id, :post, :user_id, :user
 
   def self.prune!
     joins(:post).where("posts.is_pending = FALSE AND posts.is_flagged = FALSE").each do |post_disapproval|