Laravel 每个用户只有一个 friend_id

Question

我只是从 laravel 开始，想知道是否有人可以提供帮助，我从数据库中创建了 friend_id 和 user_id，并在将 user_id 添加到 friend_id 的视图（还不确定 XD 的术语是什么）一切正常，但每次我按下添加好友按钮时，好友用户都会重复，所以我的问题是如何如何添加用户而不让用户复制数据？

好友控制器

public function store(Request $request)
    {

        //check I have a post with a friend id
        $validator = Validator::make($request->all(), [
            'friend_id' => 'required'
        ]);

        if ($validator->fails()) {
            return redirect('/posts')
                ->withErrors($validator)
                ->withInput();
        }

        //get the current user
        $user = Auth::user();

        //attach friend to current user
        $data = [
            'friend_id' => $request->input('friend_id'),
            'user_id' => $user->id,
        ];
        

        $friend = $user->friends()->where('friend_id', $request->input('friend_id'))->get();


        $friend = $user->friends()->create($data);

        //redirect back to XXX        
        return redirect('/posts');      

    }

    <div class="row justify-content-md-center">
        <div class="col-3 mt-3">

            @foreach ($friends as $friend)

                <form method="post" action="/friends">
                    @csrf
                    <div class="text-center border p-2">
                        {{ $friend->id }}

                        {{ $friend->name }}
                    
                        <div class="row justify-content-center">
                            <button type="submit" name="friend_id" value="{{$friend->id}}"  class="btn btn-primary">Add Friend</button>
                        </div>
                    </div>                              
                </form>
            @endforeach
        </div>
    </div>

这是我老板的建议，在数据库中只添加一个好友 ID 就可以了

//check I have a post with a friend id
$validator = Validator::make($request->all(), [
'friend_id' => 'required'
]);

if ($validator->fails()) {
return redirect('/posts')
->withErrors($validator)
->withInput();
}

//get the current user
$user = Auth::user();

//attach friend to current user
$data = [
'friend_id' => $request->input('friend_id'),
'user_id' => $user->id,
];

$friend = $user->friends()->where('friend_id', $request->input('friend_id'))->get();

if(!$friend)
{
$friend = $user->friends()->create($data);
}

Answer 1

您可以使用 firstOrCreate 轻松完成此操作：

public function store(Request $request)
{
     $request->validate([
'friend_id' => 'required'
]);       

auth()->user()->friends()->firstOrCreate([
 'friend_id' => $request->friend_id
]);
}

但是逻辑有点不对，

我猜，你的 friends() 用户模型上的关系指的是 2 个用户（某种程度上）之间的枢轴 table

你应该这样做:

枢轴 table :

编号 | user_id | friend_id

用户模型：

public function friends(){
    return $this->belongsToMany(User::class, 'friends', 'user_id', 'friend_id');
}

然后在你的控制器中：

auth()->user()->friends()->syncWithoutDetaching([$request->friend_id]);

Laravel 每个用户只有一个 friend_id

Laravel only one friend_id per user

php

laravel

laravel-blade