Diferença entre Rails x Laravel

Laravel.php

Class User extends Eloquent {

  public $acessible = array ('name', 'email');

  public function posts () {

    return $this->has_many('Post');

  }

  public function delete() {

     Post::where_user_id($this->id)->delete();
     parent::delete();

  }

}

Class Post extends Eloquent {

  public function user() {

     return $this->belongs_to('User');

  }

}

User.rb

class User < ActiveRecord::Base
  attr_accessible :name, :email
  has_many :posts, :dependent => :destroy
end

class Post < ActiveRecord::Base
  belongs_to :user
end