laravel中表单提交获取字段会将空值转换为null的解决方案

<?php

namespace Illuminate\Foundation\Http\Middleware;

class ConvertEmptyStringsToNull extends TransformsRequest
{
    /**
     * Transform the given value.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return mixed
     */
    protected function transform($key, $value)
    {
        return is_string($value) && $value === '' ? null : $value;
    }
}

// app/Http/Middleware/NinjaAuther.php 新增文件

namespace App\Http\Middleware;

class NinjaAuther extends TransformsRequest
{

/**
 * Transform the given value.
 *
 * @param  string  $key
 * @param  mixed  $value
 * @return mixed
 */
protected function transform($key, $value)
{
        if(is_string($value) && !in_array($key,  ['abc'], true)) {
            $value = $value === '' ? null : $value;
        }

    return $value;
    }
}

// app/Http/Kernel.php 部分代码

protected $middleware = [
        \App\Http\Middleware\CheckForMaintenanceMode::class,
        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
        \App\Http\Middleware\TrimStrings::class,
        // \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class, // 这一条注释掉
        \app/Http/Middleware/NinjaAuther.class, // 新增的记录
        \App\Http\Middleware\TrustProxies::class,
    ];

// app/Http/Controllers/StoreController.php

<?php

namespace App\Http\Controllers;

use App\Store;
use Illuminate\Http\Request;

class StoreController extends Controller
{
    public function save(Request $request) {
        $store = new Store();
        $store->title = strval($request->input("title")); // 对获取的字段进行格式转换
        $store->address = strval($request->input("address"));
        $store->longitude = doubleval($request->input("longitude"));
        $store->latitude = doubleval($request->input("latitude"));
        $store->introduction = strval($request->input("introduction"));
        $store->text = strval($request->input("text"));
        $store->status = intval($request->input("status"));
        $store->save();
    }
}