Auto Callback for Relationship Collection

autoCallback

<?php

class Car extends Eloquent {
  
  //wheels relationship
  public function wheels(){
    return $this->hasMany('Wheel');
  }
  
  //current hack
  public function getWheelsAttribute(){
    
    //get wheels
    $wheels = $this->wheels;
    
    //callback
    $wheels->each(function($wheel){
			$wheel->turn(90);
		});
		
		//return wheels collection
		return $wheels;
  }
  
  //proposed feature
  //gets called automatically when laravel uses magic method on relationship
  //naming convention is what allows it to automagically happen
  public function wheelsCollectionCallback($wheels){
   
    //callback
    $wheels->each(function($wheel){
			$wheel->turn(90);
		});
		
		//return wheels collection
		return $wheels;
    
  }
  
}
?>

<?php
//user doesn't need to change existing usage
$car = Car::find(1);

foreach($car->wheels as $wheel){
  
}

You could just use a mutator or an observer...