In the framework jungle: Laravel Basic Model

gistfile1.php

class User extends Eloquent {   
    public $rules = array(
        'email' => 'required|email|unique:users',
        'password' => 'between:8,50'
    );

    public function posts()
    {
        return $this->has_many('Post');
    }

}

class Post extends Eloquent {
    public $rules = array(
        'name' => 'required|between:3,45',
        'content' => 'required|between:8,2000'
    );

    public function tags()
    {
        return $this->has_many_and_belongs_to('Tag');
    }

    public function user()
    {
        return $this->belongs_to('User');
    }
}

class Tag extends Eloquent {

    public function posts()
    {
        return $this->has_many_and_belongs_to('Post');
    }
}