试图访问 null laravel 类型值的数组偏移量

Question

我使用了所有五种方法，但都没有奏效。并且不存储在数据库中。

我在educationals 表中有一行

而我的表格就是这样的demo

我的刀

<input  name="study[field]">
<input  name="study[branch]">
<input  name="study[grade_id]">
<input  name="study[institution_id]">
<input  name="study[institution_education]">
<input  name="study[gpa]">
<input  name="study[nation_id]">
<input  name="study[province_id]">
<input  name="study[town_id]">
<input  name="study[branch]">
<input  name="study[province_name]">
<input  name="study[town_name]">
<input  name="study[entrance]">
<input  name="study[graduate]">
<input  name="study[currently_studying]">

我的控制器

    foreach ($request->field as $key => $value) {
        Educational::firstOrCreate(['user_id' => auth()->id()], [
            'grade_id' => $request->grade_id[$key],
            'field' => $request->field[$key],
            'institution_id' => $request->institution_id[$key],
            'branch' => $request->branch[$key],
            'institution_education' => $request->institution_education[$key],
            'gpa' => $request->gpa[$key],
            'nation_id' => $request->nation_id[$key],
            'province_id' => $request->province_id[$key],
            'town_id' => $request->town_id[$key],
            'province_name' => $request->province_name[$key],
            'town_name' => $request->town_name[$key],
            'entrance' => $request->entrance[$key],
            'graduate' => $request->graduate[$key],
            'currently_studying' => $request->has("currently_studying.$key"),
        ]);
    }

我收到此错误。

得到dd后：

Answer 1

您使用错误的变量来获取预期值。在您的示例中，grade_id 不是数组而是 null，因为您的请求正文的根级别中没有 grade_id，而是在 study 属性中。

如果$request->study 已经是一个包含这些所需值的数组，您只需通过$request->study[property] 检索它们。

考虑：

Educational::firstOrCreate(['user_id' => auth()->id()], [
    'grade_id' => $request->study['grade_id'],
    'field' => $request->study['field'],
    'institution_id' => $request->study['institution_id'],
    'branch' => $request->study['branch'],
    'institution_education' => $request->study['institution_education'],
    'gpa' => $request->study['gpa'],
    'nation_id' => $request->study['nation_id'],
    'province_id' => $request->study['province_id'],
    'town_id' => $request->study['town_id'],
    'province_name' => $request->study['province_name'],
    'town_name' => $request->study['town_name'],
    'entrance' => $request->study['entrance'],
    'graduate' => $request->study['graduate'],
    'currently_studying' => $request->study['currently_studying'] ? true : false,
]);

你看到只是通过研究检索所有内容。

事实上，这很容易，因为您的所有请求字段都与您的模型属性具有相同的名称，请执行以下操作：

Educational::firstOrCreate(['user_id' => auth()->id()], $request->study);