Formatting and Rails 3 callbacks

app/models/wiki_page.rb

@@ -26,7 +26,7 @@ class WikiPage < ActiveRecord::Base
   # Plugins
   acts_as_paranoid
   acts_as_list :scope => 'course_id = #{course_id}'
-	acts_as_versioned :if_changed => [ :content, :description, :title ]
+  acts_as_versioned :if_changed => [:content, :description, :title]
   self.non_versioned_columns << 'front_page'
   self.non_versioned_columns << 'position'
   self.non_versioned_columns << 'deleted_at'
@@ -37,6 +37,7 @@ class WikiPage < ActiveRecord::Base
   belongs_to :user, :with_deleted => true
 
   # Valicacao
+  validates_presence_of :front_page
   validates_presence_of :description
   validates_presence_of :title
   validates_presence_of :content
@@ -44,16 +45,21 @@ class WikiPage < ActiveRecord::Base
   validates_uniqueness_of :canonical_title, :scope => :course_id
   validates_format_of :title, :with => /^[^0-9]/
 
+  before_validation :set_canonical_title
+  before_save :set_position
+
   # acts_as_paranoid_versioned
   self.versioned_class.class_eval do
-	  def self.delete_all(conditions = nil); return; end
+    def self.delete_all(conditions = nil)
+      return
+    end
   end
 
-	def before_validation
+  def set_canonical_title
     self.canonical_title = self.title.pretty_url
   end
 
-	def before_save
+  def set_position
     if !self.front_page
       self.remove_from_list
     elsif self.position.nil?
@@ -74,7 +80,7 @@ class WikiPage < ActiveRecord::Base
   end
 
   def self.find_front_page
-		WikiPage.find(:all, :conditions => [ "front_page = ?", true ])
+    WikiPage.all(:conditions => ["front_page = ?", true])
   end
 
   def WikiPage.diff(from, to)