Added role helper methods, and set some abilities

app/models/ability.rb

@@ -4,7 +4,9 @@ class Ability
   def initialize(user)
     user ||= User.new
     
-    can :manage, :all if user.admin?
+    can :manage, :all if user.admin? 
+    
+    can :manage, Post if user.moderator?
     
     can :read, Category, :state => true
     can :read, Forum, :state => true, :category => { :state => true }
@@ -16,5 +18,7 @@ class Ability
     
     can :create, Post, :topic => { :locked => false } unless user.new_record?
     can :create, Topic unless user.new_record?
+
+    cannot :read, :all if user.banned?
   end
 end

app/models/user.rb

@@ -1,6 +1,8 @@
 class User < ActiveRecord::Base
   include Gravtastic
 
+  before_create :set_default_role
+
   belongs_to :role
 
   gravtastic :size => 165, :filetype => :png, :rating => 'R'
@@ -18,7 +20,24 @@ class User < ActiveRecord::Base
   has_many :topics, :dependent => :destroy
   has_many :posts, :dependent => :destroy
   
+  def registered?
+    self.role == Role.find_by_name('registered')
+  end
+
+  def banned?
+    self.role == Role.find_by_name('banned')
+  end
+
+  def moderator?
+    self.role == Role.find_by_name('moderator')
+  end
+  
   def admin?
-    self.is_admin
+    self.role == Role.find_by_name('admin')
+  end 
+  
+  private
+  def set_default_role
+    self.role ||= Role.find_by_name('registered')
   end
 end