phpvms/app/Http/Resources/Flight.php

<?php

namespace App\Http\Resources;

use App\Contracts\Resource;
use App\Http\Resources\SimBrief as SimbriefResource;
use App\Support\Units\Distance;
use stdClass;

/**
 * @mixin \App\Models\Flight
 */
class Flight extends Resource
{
    /**
     * Set the fields on the flight object
     */
    protected function setFields()
    {
        /** @var \Illuminate\Support\Collection $field_values */
        $return_values = new stdClass();
        $field_values = $this->field_values;
        if (empty($field_values) || $field_values->count() === 0) {
            return $return_values;
        }

        foreach ($field_values as $field) {
            $return_values->{$field->name} = $field->value;
        }

        return $return_values;
    }

    /**
     * @param \Illuminate\Http\Request $request
     *
     * @throws \PhpUnitsOfMeasure\Exception\NonNumericValue
     * @throws \PhpUnitsOfMeasure\Exception\NonStringUnitName
     *
     * @return array
     */
    public function toArray($request)
    {
        $res = parent::toArray($request);

        $res['ident'] = $this->ident;

        if (empty($res['load_factor'])) {
            $res['load_factor'] = setting('flights.default_load_factor');
        }

        if (empty($res['load_factor_variance'])) {
            $res['load_factor_variance'] = setting('flights.load_factor_variance');
        }

        $distance = new Distance($res['distance'], config('phpvms.internal_units.distance'));
        $res['distance'] = $distance->getResponseUnits();

        $res['airline'] = new Airline($this->airline);
        $res['subfleets'] = Subfleet::collection($this->whenLoaded('subfleets'));
        $res['fields'] = $this->setFields();

        // Simbrief info
        $res['simbrief'] = new SimbriefResource($this->whenLoaded('simbrief'));

        return $res;
    }
}