Laravel Eloquent whereHas query example

eloquentWhereHas.php

class TaxonomyEntity extends Model
{
  /**
	 * Get a list of categories with optional limit and order parameters.
	 * @param  integer $limit
	 * @param  string  $order
	 * @return @return\Illuminate\Database\Eloquent\Collection
	 */
	public function getCategories($limit = 5, $order = 'DESC')
	{
		$categories = TaxonomyEntity::whereHas('taxonomy_types', function($query) {
			$query->where('taxonomy_type_name', 'category');
		})->take($limit)
      ->get();
	}

  /**
     * Get taxonomy type for this taxonomy entity.
     * @return\Illuminate\Database\Eloquent\Collection
     */
    public function taxonomy_types()
    {
    	return $this->hasMany('App\Models\TaxonomyType', 'id', 'taxonomy_types_fk');
    }
}