izyim/app/Http/Resources/Warehouse.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class Warehouse extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        $billing = $this->addressBook()->where('reference_id',  $this->id)->where('type', 2)->where('billing', true)->first();
        return [
            'id' => $this->id,
            'name' => $this->name,
            'email' => $this->email,
            'street_one' => $billing ? $billing->street_one : null,
            'street_two' => $billing ? $billing->street_two : null,
            'city' => $billing ? $billing->city : null,
            'state' => $billing ? $billing->state : null,
            'post_code' => $billing ? $billing->post_code : null,
            'country' => $billing ? $billing->country : null
        ];
    }
}