Laravel 返回 null 和我的新表单创建的数据答案

【问题标题】：Laravel with return null with datas create by my new formLaravel 返回 null 和我的新表单创建的数据
【发布时间】：2020-09-25 10:00:59
【问题描述】：

这是我的模型：

// 专业模型

class Specialties extends Model
{
  protected $guarded = [];

  protected $table = 'specialties';

  protected $primaryKey = 'id';

  protected $fillable = [
    'name', 'region_id', 'description', 'picture', 'url', 'author', 'code'
  ];

  public function regions() 
  {
    return $this->belongsTo('App\Regions', 'id');
  }
}

// 区域模型

class Regions extends Model
{
  protected $table = 'regions';

  protected $primaryKey = 'id';

  public function specialties() 
  {
    return $this->hasMany('App\Specialties', 'region_id');
  }
}

// 我的控制器功能添加新的专业

public function store(Request $request, Recaptcha $recaptcha)
{
    $validatedData = $request->validate([
        'name' => 'required|string|max:50',
        'region' => 'required|integer',
        'description' => 'required|string|max:1000',
        'image_file' => 'required|file|mimes:jpeg,jpg,png,gif|max:2048',
        'url' => 'nullable|string|max:2000',
        'author' => 'nullable|string|max:50',
        'recaptcha' => ['required', $recaptcha],
    ]);

    Storage::disk('public')->putFileAs('/img/uploads/specialties', new File($validatedData['image_file']), pathinfo($validatedData['image_file']->getClientOriginalName(), PATHINFO_FILENAME) . time() . '.' . $validatedData['image_file']->getClientOriginalExtension());

    $code = str_slug($validatedData['name'], "-");

    $image_name = pathinfo($validatedData['image_file']->getClientOriginalName(), PATHINFO_FILENAME) . time() . '.' . $validatedData['image_file']->getClientOriginalExtension();

    $specialty = Specialties::create([
        'name' => $validatedData['name'],
        'region_id' => $validatedData['region'],
        'description' => $validatedData['description'],
        'picture' => $image_name,
        'url' => $validatedData['url'],
        'author' => $validatedData['author'],
        'code' => $code
    ]);

    return response(['specialty' => $specialty], 201);
}

// 我的函数有问题：

public function index()
{
    $actives = Specialties::with('regions')
        ->where('active', 1)
        ->get();
    $inactives = Specialties::with('regions')
        ->where('active', 0)
        ->get();

    return [
        'actives' => $actives,
        'inactives' => $inactives
    ];
}

我的问题是 with('regions') 在最后一个函数中返回 null，例如，如果我创建一个新的专业“StackOverflow”：

active: 1
author: null
code: "stackoverflow"
created_at: "2020-09-24T16:59:29.000000Z"
description: "blablabla"
id: 18
name: "StackOverflow"
picture: "test600966769.jpg"
region_id: 1
regions: null <- Here the problem
updated_at: "2020-09-24T16:59:50.000000Z"
url: null

有人知道这个问题吗？谢谢！！！

【问题讨论】：

标签： php laravel eloquent relationship

【解决方案1】：

答案：

你的SpecialtiesModel有错regions function，

解释：

belongsTo方法第二个参数应该是当前表模型的foreign key name，第三个参数是引用表的primary key id名称

您的代码示例： return $this->belongsTo('App\Regions', 'region_id');

【讨论】：