belongs_to("user");

            $t->string("title", "permalink");
            $t->text("content");

            $t->datetime("published_at");
            $t->timestamps();
        });
    }

    static function down()
    {
        static::drop_table("articles");
    }
}


/**
 *
 * $article = new Article();
 * // => #

 * 
 * $article->title = "test title";
 * $article->content = "test content";
 * // => #

 * 
 * $article->save();
 * #

 * 
 *
 */
class Article extends ActiveRecord::Base
{
    // should give me:
    // Article::recent->find("all") => returns the 10 most recent articles
    // Article::published->find("all") => returns all articles which are published
    // Article::recent->published->find("all") => returns the 10 most recent, published articles
    static $named_scope = array(
        array("recent", "limit" => 10, "order" => "published_at DESC"),
        array("published", "conditions" => function() {
            return array("published_at <= ?", time());
        })
    );

    // $article->user;
    // would return the User row with this article's user_id as an ActiveRecord Object
    static $belongs_to = array("user");

    // would make sure that title and content fields are not Empty
    static $validates_presence_of = array('title', 'content');

    // would run "update_published_at" before saving any Article Object
    static $before_save = array("update_published_at");

    function update_published_at()
    {
        if ($this->draft)
        {
            $this->write_attribute("published_at", null);
        }
    }

    function is_draft()
    {
        return !$this->is_new_record() && $this->published_at;
    }

    function set_draft($value)
    {
        if ($value == "1")
        {
            $this->draft = true;
        }
    }
}