SQLSTATE [HY000]：常规错误：1364字段＆＃x27; user_id＆＃x27;没有默认值Laravel 5.8

Question

SQLSTATE [HY000]：常规错误：1364字段'user_id'没有默认值（SQL：插入Reports （detter> datery_name >，ic，<代码>电话，current_location，status，emg_code，updated_at，create_at）值（DFD，女性，SDF，SDF，SDF，SDF，SDF，SDF，SDF，2022-06-13 05:53:11，2022-06-06-13 05:53 05:53 ：11））

我可以知道如何解决这个问题吗？ USER_ID是用户表的外键。

用户表：

  Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('profile_image');
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');

            $table->rememberToken();
            $table->timestamps();
        });

用户模型：

public function reports()
{
    return $this->hasMany(Report::class);
}

报告表：

  Schema::create('reports', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->unsignedBigInteger('user_id');
        $table->string('patient_name');
        $table->string('gender');
        $table->string('ic');
        $table->string('phone');
        $table->string('current_location');
        $table->string('status');
        $table->string('emg_code');
        $table->softDeletes();
        $table->timestamps();

       
        $table->foreign('user_id')
            ->references('id')
            ->on('users')
            ->onDelete('cascade');

    });

ReportController创建Func。：ReportController

  public function create()
    {
        $users = User::select('id', 'name')->get();
        $users = $users->pluck('name');

        return view('admin.reports.create', compact('users'));
    }

Store Func。：HASUSER

   public function store(Request $request)
    {
        $this->validate($request, [
            'patient_name' => 'required|string',
            'gender' => ['required', 'in:male,female'],
            'ic' => 'required|string',
            'phone' => 'required|string',
            'current_location' => 'required|string',
            'status' => 'required|string',
            'emg_code' => 'required|string'

        ]);
        $requestData = $request->all();

        $report = Report::create($requestData);


        foreach ($request->users as $user) {
            $report->assignUser($user);
        }

        return redirect('admin/reports')->with('flash_message', 'Report added!');
    }

特征：

public function user()
    {
        return $this->belongsTo(User::class);
    }

    public function assignUser($user)
    {
        return $this->users()->save(
            User::whereName($user)->firstOrFail()
        );
}

报告模型：

class Report extends Model
{
    use HasUser;
    
          protected $fillable = [
                'user_id',
                'patient_name',
                'gender',
                'ic',
                'phone',
                'current_location',
                'status',
                'emg_code'
            ];

}