fixes #1561

app/models/wiki_page.rb

@@ -3,6 +3,7 @@ class WikiPage < ActiveRecord::Base
   before_validation :initialize_creator, :on => :create
   before_validation :initialize_updater
   after_save :create_version
+  before_destroy :create_mod_action_for_destroy
   belongs_to :creator, :class_name => "User"
   belongs_to :updater, :class_name => "User"
   validates_uniqueness_of :title, :case_sensitive => false
@@ -159,4 +160,8 @@ class WikiPage < ActiveRecord::Base
       end
     end.map {|x| x.mb_chars.downcase.tr(" ", "_").to_s}
   end
+
+  def create_mod_action_for_destroy
+    ModAction.create(:description => "permanently deleted wiki page [[#{title}]]")
+  end
 end