post.rb

class Post 
  require 'lib/encryptable'
  include MongoMapper::Document
  include ApplicationHelper 
  include ROXML
  include Diaspora::Webhooks
  include Encryptable

  xml_accessor :_id
  xml_accessor :person, :as => Person

  key :person_id, ObjectId

  many :comments, :class_name => 'Comment', :foreign_key => :post_id
  belongs_to :person, :class_name => 'Person'
  
  
  cattr_reader :per_page
  @@per_page = 10
    
  timestamps!

  after_save :send_to_view
  after_save :notify_people
 
  before_destroy :propagate_retraction
  after_destroy :destroy_comments, :remove_from_view

  def self.stream
    Post.sort(:created_at.desc).all
  end

 def self.newest(person = nil)
    return self.last if person.nil?

    self.first(:person_id => person.id, :order => '_id desc')
  end

   def self.my_newest
     self.newest(User.owner)
   end
  def self.newest_by_email(email)
    self.newest(Person.first(:email => email))
  end

#ENCRYPTION
    before_validation :sign_if_mine
    validates_true_for :creator_signature, :logic => lambda {self.verify_creator_signature}
    
    xml_accessor :creator_signature
    key :creator_signature, String
    
    def signable_accessors
      accessors = self.class.roxml_attrs.collect{|definition| 
        definition.accessor}
      accessors.delete 'person'
      accessors.delete 'creator_signature'
      accessors
    end

    def signable_string
      signable_accessors.collect{|accessor| 
        (self.send accessor.to_sym).to_s}.join ';'
    end
  
  def log_inspection
    Rails.logger.info self.inspect
  end
  def log_save_inspection
    Rails.logger.info "After saving, object is:"
    log_inspection
  end

protected
   def destroy_comments
    comments.each{|c| c.destroy}
  end
  
  def propagate_retraction
    Retraction.for(self).notify_people
  end

  def send_to_view
    SocketsController.new.outgoing(self)
  end
  
  def remove_from_view
    SocketsController.new.outgoing(Retraction.for(self))
  end

end