updated readme

app/models/ability.rb

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+class Ability
+  include CanCan::Ability
+
+  def initialize(user)
+    user ||= User.new
+    
+    can :manage, :all if user.admin?
+    
+    can :read, Category, :state => true
+    can :read, Forum, :state => true, :category => { :state => true }
+    can :read, Topic, :forum => { :state => true, :category => { :state => true } }
+    can :read, Post, :topic => { :forum => { :state => true, :category => { :state => true } } }
+    
+    can :update, Post, :user_id => user.id
+    can :destroy, [Topic,Post], :user_id => user.id
+    
+    can :create, Post unless user.new_record?
+    can :create, Topic unless user.new_record?
+  end
+end

app/models/category.rb

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+class Category < ActiveRecord::Base
+  
+  # Associations
+  has_many :forums, :dependent => :destroy
+  
+  # Accessors
+  attr_accessible :title, :state, :position, :category_id
+  
+  # Scopes
+  default_scope :order => 'position ASC'
+  
+  # Validations
+  validates :title,       :presence => true
+end

app/models/forum.rb

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+class Forum < ActiveRecord::Base
+  
+  # Associations
+  has_many :topics, :dependent => :destroy
+  has_many :posts, :through => :topics
+  
+  belongs_to :category
+  
+  # Accessors
+  attr_accessible :title, :description, :state, :position, :category_id
+  
+  # Scopes
+  default_scope :order => 'position ASC'
+  
+  # Validations
+  validates :title,       :presence => true
+  validates :description, :presence => true
+  validates :category_id, :presence => true
+end

app/models/post.rb

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+class Post < ActiveRecord::Base
+  
+  # Associations
+  belongs_to :forum, :counter_cache => true
+  belongs_to :topic, :counter_cache => true, :touch => true 
+  belongs_to :user, :class_name => "User", :counter_cache => true
+  
+  # Accessors
+  attr_accessible :body
+  
+  # Validations
+  validates :body, :presence => true
+  validates :user, :presence => true
+  
+  # Default Scope
+  default_scope :order => 'created_at ASC'
+  
+  # Scope to display only the last n posts. Used for "Recent Posts" display
+  scope :recent, lambda {
+    |c| reorder('created_at desc').limit(c)
+  }
+  
+  # Callbacks
+  before_save :topic_locked?
+  
+  # Methods
+  private
+    def topic_locked?
+      if topic.locked?
+        errors.add(:base, "That topic is locked")
+        false
+      end
+    end
+end

app/models/topic.rb

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+class Topic < ActiveRecord::Base
+  
+  # Associations
+  has_many :posts, :dependent => :destroy
+  belongs_to :forum, :counter_cache => true
+  belongs_to :user, :class_name => "User", :counter_cache => true
+  
+  # Accessors
+  attr_accessor :body
+  attr_accessible :title, :body, :sticky, :locked
+  
+  # Validations
+  validates :title,   :presence => true
+  validates :body,    :presence => true, :on => :create
+  validates :posts,   :presence => true, :allow_nil => false, :on => :update
+  validates :user,    :presence => true
+  
+  # Scopes
+  default_scope :order => 'sticky DESC, updated_at DESC'
+  
+  # Callbacks
+  after_create :create_initial_post
+  
+  # Methods
+  def hit!
+    self.class.increment_counter :hits, id
+  end
+  
+  private
+    def create_initial_post
+      returning self.posts.build(:body => self.body) do |post|
+        post.forum = self.forum
+        post.user = self.user
+        post.save
+      end
+    end
+end

app/models/user.rb

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+class User < ActiveRecord::Base
+  include Gravtastic
+  gravtastic :size => 165, :filetype => :png, :rating => 'R'
+    
+  # Include default devise modules. Others available are:
+  # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :trackable, :validatable
+
+  validates :username, :presence => true, :uniqueness => true
+
+  # Setup accessible (or protected) attributes for your model
+  attr_accessible :username, :email, :password, :password_confirmation, :remember_me
+  
+  has_many :topics, :dependent => :destroy
+  has_many :posts, :dependent => :destroy
+  
+  def admin?
+    true if self.username == 'codezombie'
+  end
+end