Laravel 4 Global Scope (fields for select)

ModelWithScope.php

<?php

use Illuminate\Database\Eloquent\Model;

class ModelWithScope extends Model
{
	use SelectableTrait;

	protected $selectable = [
		'id', 'title', 'created_at'
	];
}

SelectableScope.php

<?php

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\ScopeInterface;

class SelectableScope implements ScopeInterface
{
	/**
	 * Apply the scope to a given Eloquent query builder.
	 *
	 * @param Builder  $builder
	 * @return void
	 */
	public function apply(Builder $builder)
	{
		$builder->select($builder->getModel()->getSelectableColumns());
	}

	/**
	 * Remove the scope from the given Eloquent query builder.
	 *
	 * @param Builder  $builder
	 * @return void
	 */
	public function remove(Builder $builder)
	{
		$builder->getQuery()->select(['*']);
	}
}

SelectableTrait.php

<?php

trait SelectableTrait
{
	public static function bootSelectableTrait()
	{
		static::addGlobalScope(new SelectableScope);
	}

	public function getSelectableColumns()
	{
		return isset($this->selectable) ? $this->selectable : ['*'];
	}
}