Eager loading relationships in a repository

eager-load-relations-repository

// If we have a model that has a lot of relationships, we need a method to be able to dynamically 
// eager-load those relationships in an easy way

// For example, some controller methods may only require one relationship to be loaded
// Others may require all relationships to be eager loaded

// Repository
class UserRepository implements UserInterface
{
    public function find($id, $relations = array())
    {
        return Song::with($relations)->findOrFail($id);
    }    
}

// Controller

// just load the user
$user = $this->users->find(1);

// Load up some relationships
$this->users->find(1, array('groups', 'status', 'books'));