In my model I have total price calculation based on hasMany relationship. It looks like this:

public function totalPrice(): string
{
    return num_format($this->hasMany(Direction::class)->sum('price'));
}

I use num_format function which is described in helper.php file. In case I need to change number formatting I can always edit helper function. But I wonder if there be a better/nicer way to do this? As far as I understand I can't use $casts for function in this situation? What are your thoughts? Do you think apporach I'm using is correct? Thank you for your thoughts

CodePudding user response：

I think this is fine, I personally would decouple the relation, then have totalPrice be num_format($this->directions()->sum('price'))

If you wanted a global way of defining this, you can define a global scope which would be called something like sumWithDp and then in any model with a defined relation you can call:

$this->relation()->sumWithDp('price', $decimalPlaces)

(or just always have it be 2 DP if you wanted)