config-service/app/Repositories/PlatformContentRepository.php

<?php
namespace App\Repositories;
use App\Models\PlatformContent;
use Symfony\Component\HttpKernel\Exception\HttpException;

/**
 * Created by PhpStorm.
 * User: durong
 * Date: 2019/6/17
 * Time: 下午6:46
 */

class PlatformContentRepository
{
    public function __construct(PlatformContent $platformContent)
    {
        $this->platformContent = $platformContent;
    }

    public function index($request)
    {
        if (isset($request['id'])){
            return $this->platformContent
                ->where('id',$request['id'])->orderBy('id', 'desc')->first();
        }

            $this->platformContent = $this->platformContent
                ->orderBy('id', 'desc')->get();

            return $this->platformContent;
    }

}