fixes #2448: Approvers can undelete posts they already approved/uploaded

app/controllers/moderator/post/posts_controller.rb

@@ -3,7 +3,7 @@ module Moderator
     class PostsController < ApplicationController
       before_filter :moderator_only, :only => [:delete, :undelete, :move_favorites, :ban, :unban, :confirm_delete, :confirm_move_favorites, :confirm_ban]
       before_filter :admin_only, :only => [:expunge]
-      rescue_from ::PostFlag::Error, :with => :rescue_exception
+      rescue_from ::PostFlag::Error, ::Post::ApprovalError, :with => :rescue_exception
 
       def confirm_delete
         @post = ::Post.find(params[:id])

app/models/post.rb

@@ -1214,7 +1214,6 @@ class Post < ActiveRecord::Base
         give_favorites_to_parent if options[:move_favorites]
         update_parent_on_save
 
-
         unless options[:without_mod_action]
           if options[:reason]
             ModAction.create(:description => "deleted post ##{id}, reason: #{options[:reason]}")
@@ -1231,6 +1230,14 @@ class Post < ActiveRecord::Base
         return false
       end
 
+      if !CurrentUser.is_admin? 
+        if approver_id == CurrentUser.id
+          raise ApprovalError.new("You have previously approved this post and cannot undelete it")
+        elsif uploader_id == CurrentUser.id
+          raise ApprovalError.new("You cannot undelete a post you uploaded")
+        end
+      end
+
       self.is_deleted = false
       self.approver_id = CurrentUser.id
       save