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class Post extends Eloquent {
    
    /**
     * This is a useful switch to temporarily turn of automatic model validation.
     */
    public static $autoValidate = true;
    
    /**
     * The rules to use for the model validation.
     * Define your validation rules here.
     *
     * @var array
     */
    protected static $rules = array();

    protected static function boot()
    {
        // This is an important call, makes sure that the model gets booted
        // properly!
        parent::boot();
        
        // You can also replace this with static::creating or static::updating
        // if you want to call specific validation functions for each case.
        static::saving(function($model)
        {
            if($model::$autoValidate)
            {
                // If autovalidate is true, validate the model on create
                // and update.
                return $model->validate();
            }
        });

        // cause a delete of a post to cascade to children so they are also deleted
        static::deleted(function($post)
        {
            $post->images()->delete();
            $post->descriptions()->delete();
        });
    }
    
    public function validate()
    {
        // ... Your validation goes here ...
    }
}