在 laravel 中使用 pluck() 辅助函数

Question

我正在 laravel 5.5 上构建一个小型应用程序，其中我从以下格式的表单中获取包含多个用户信息的列表：

{
    "name":"Test",
    "description":"Test the description",
    "users":[
        {
            "value":"XYZabc123",
            "name":"Nitish Kumar",
            "email":"nitishkumar@noeticitservices.com"
        },
        {
            "value":"MFnjMdNz2DIzMJJS",
            "name":"Rajesh Kumar Sinha",
            "email":"rajesh@noeticitservices.com"
        }
    ]
}

我只想通过 laravel collection 从用户数组中获取 value 键，如下所示：

$userIds = $request->users->pluck('value');

这样我就可以将它们放入查询中：

$user = User::all()->whereIn('unique_id', $userIds);

可能是我做错了大部分事情，但我的主要动机是使用 laravel collection 或 helper 函数并为此编写更清晰的代码：

$teamData['name'] = $request->name;
$teamData['description'] = $request->description;
$teamData['unique_id'] = str_random();

$users = $request->users;

$team = Team::create($teamData);

if($team)
{
    $userIds = [];

    foreach ($users as $user)
    {
        $getUser = User::where('unique_id', $user['value'])->get()->first();
        $userIds [] = $getUser->id;
    }

    $team->users()->attach($userIds);

    return response()->json(['message' => 'Created Successfully'], 200);
}

return response()->json(['message' => 'Something went wrong'], 500);

我还在学习collections，欢迎任何建议。谢谢

Answer 1

来自 $request（表单）的数据不是 collection。它是一个数组。如果你需要它是collection，你应该先把它转换成collection。

PS。如果您在单个方法中有多个数据库操作，那么最好有数据库事务。

\DB::transaction(function () use ($request) {
    // convert it to collection
    $users = collect($request->users);

    $team = Team::create([
        'name' => $request->name,
        'description' => $request->description,
        'unique_id' => str_random(),
    ]);

    $team->users()->attach($users->pluck('value')->toArray()); 
});

// HTTP Created is 201 not 200
return response()->json(['message' => 'Created Successfully'], 201);

或者您需要这样的东西：

return \DB::transaction(function () use ($request) {
    $users = collect($request->users);

    $team = Team::create([
        'name' => $request->name,
        'description' => $request->description,
        'unique_id' => str_random(),
    ]);

    $team->users()->attach($users->pluck('value')->toArray());

    return response()->json([
        'message' => 'Created Successfully',
        'data' => $team,
    ], 201); 
});

Answer 2

I just want to get the value key form the users array via laravel collection

只需使用 map 然后:

$userIds = $request->users->map(function($user) {
    return $user->value;  // or $user['value'] ? not sure if this is an array
});

编辑：

如果 $request->users 不是一个集合，在调用 map 之前把它变成一个集合：

$users = collect($request->users);

$userIds = $users->map(function($user) {
    return $user->value;  // or $user['value'] ? not sure if this is an array
});

在 laravel 中使用 pluck() 辅助函数

Using pluck() helper function in laravel

laravel

laravel-collection

laravel-eloquent

laravel-5.5