laravel - 如何防止 Laravel 剥离空数组

Question

正如标题所说，如何防止 Laravel 删除输入 json 中的空数组？示例:给定客户端请求

$.ajax({
    url: "/test",
    data: {
        populatedArray: ["Fine, as long as it has >0 elements"],
        emptyArray: [], // This property will not be available!
        tasks: {
            fooTask: {
                empty: [],
                nullObject: null,
                regular: "It should also work for nested"
            }
        }   
    },
    contentType: "application/json",
});

和 Controller

public function test(Request $request) {        
    Log::info(json_encode($request->populatedArray));
    Log::info(json_encode($request->emptyArray));
}

我收到以下日志消息:

[2018-01-30 12:30:01] local.INFO: ["Fine, as long as it has >0 elements"]  
[2018-01-30 12:30:01] local.INFO: null  

我希望第二行产生 [] 但它不存在于 $request 对象中？？

Answer 1

在将其发送到服务器之前，将数据打包为字符串

$.ajax({
    url: "/stimpack/test/",
    data: { 
        myValue: "all good",
        populatedArray: ["Fine, as long as it has >0 elements"],
        emptyArray: [], // This property will not be available!,
        tasks: JSON.stringify({
            fooTask: {
                empty: [],
                nullObject: null,
                regular: "Hi all"
            }
        }) 
    },
    contentType: "application/json"
});

接下来，在您的 Controller 中，将字符串解压为对象，如下所示

$inputAsObject = json_decode($request->tasks);

记录它也会显示空数组

Log::info(json_encode($inputAsObject));

另一个好处是您不必担心 Laravel 将所有内容都视为关联数组。这意味着你可以这样做:

Log::info(json_encode($inputAsObject->fooTask->empty));