不要在數據透視表中插入值（Laravel 5.8）

Question

我有三個表 Students ，Subject 和 Pivot 表名稱 'student_subject' ，當使用 attach(1) 工作時（在數據透視表中插入數據）。

但是當使用 attach($request -> subject) 時不起作用

為什么 ？ 我不知道

模型 ：

班級學生

    class Student extends Model
{


    protected $fillable=['user_id','FullName','age','address','father_ID','photo_id','class_id'];

    public function subject(){
        return $this->belongsToMany(Subject::class);
    }

    public function classes(){
        return $this->belongsTo('App\classes','class_id');
    }
    public function user(){
        return $this->belongsTo('App\User');
    }
    public function photo(){
        return $this->belongsTo('App\photo');
    }


    //
}

課程主題：

    class Subject extends Model
{
    protected $fillable = ['name','user_id'];
    //

    public function student()
    {
        return $this->belongsToMany(Student::class);

    }
}

學生管理員

      public function store(Request $request)
{
    $input =$request->all();
    $user  =Auth::user();


   if ($file = $request->file('photo_id')){
       $name = time().$file->getClientOriginalName();
       $file->move('images',$name);
       $photo = photo::create(['file'=>$name]);

   $input['photo_id']=$photo->id;

   }
   $student = $user->student()->create($input);

   // $student = $user->student()->create($input);

    $request['student_id'] = $request->id;
    $student->subject()->attach(1);
    dd($student);
    return redirect('admin/students');

創建視圖：

    @foreach($subjects as $subject)
    <tr>
        <td>

            <div class="form-group" {‌{}}>
                {!! Form::label('name', $subject) !!}
                {!! Form::checkbox('name',$subject,false,                ['class'=>'form-control'])!!}
            </div>

        </td>
    </tr>
@endforeach

數據透視表'student_subject'

    public function up()
{
    Schema::create('student_subject', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->unsignedBigInteger('student_id');
        $table->unsignedBigInteger('subject_id');

        // $table->foreign('student_id')->references('id')->on('students');
        $table->foreign('student_id')->references('id')->on('students');

        $table->foreign('subject_id')->references('id')->on('subjects');
    });
}                                

Answer 1

如果您有多個復選框，則應將復選框名稱設置為數組名稱[]。

Form::checkbox('name[]', $subject, false);

然后你可以得到$request->name作為一個數組

$subjects = $request->input('name');
foreach($subjects as $subject){
 $student->subject()->attach($subject);
}

檢查這個問題Laravel - 在數據庫中存儲多個復選框表單值