ldc-gen-game-web/app/Models/FaqQuestion.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class FaqQuestion extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'question', 'answer', 'positive_vote',
        'negative_vote', 'theme_id'
    ];

    /**
     * Theme relation
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function theme()
    {
        return $this->belongsTo(FaqTheme::class, 'theme_id');
    }

    /**
     * get Utility
     * @return float|integer
     */
    public function getUtilityAttribute()
    {
        $pourcent = 0;

        if (
            $this->positive_vote !== null && $this->negative_vote !== null && $this->positive_vote >= $this->negative_vote && $this->positive_vote > 0 && $this->negative_vote > 0
        ) {
            $ratio    = $this->negative_vote / $this->positive_vote;
            $pourcent = ceil((1 - $ratio) * 100);
        }

        return $pourcent;
    }
}