osb/app/Models/Currency.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Currency extends Model
{
	public $timestamps = FALSE;

	const ROUND_HALF_UP   = 1;
	const ROUND_HALF_DOWN = 2;
	const ROUND_HALF_EVEN = 3;
	const ROUND_HALF_ODD  = 4;

	/* RELATIONS */

	public function country()
	{
		return $this->hasOne(Country::class);
	}

	/* METHODS */

	public function round($value,$mode=self::ROUND_HALF_UP)
	{
		return round($value,$this->rounding,$mode);
	}
}