如何解决传递给 App\Events\NoticeAnnouncement::__construct() 的参数 3 必须是 App\User 的实例
我正在尝试在教师发布通知时向所有学生发送邮件。为此,我在创建通知时调用一个事件,并通过事件变量传递通知、教师和用户。但它给出了一个错误,说“传递给 App\Events\NoticeAnnouncement::__construct() 的参数 3 必须是 App\User 的实例,给定的 Illuminate\Database\Eloquent\Collection 实例,在 C:\xampp\htdocs 中调用\iiucsmartclassroom\app\Http\Controllers\Teacher\NoticeController.PHP”。
这是我的通知控制器:
public function submitNotice(Request $request){
$validatedData = $request->validate([
'notice_title' => 'required|max:255','notice_description' => 'required|max:3000','notice_file.*' => 'mimes:jpg,jpeg,pdf',]);
$data=array();
$data['teacher_id']=$request->teacher_id;
$data['notice_title']=$request->notice_title;
$data['notice_description']=$request->notice_description;
$data['notice_post_date']=$request->notice_post_date;
$data['notice_post_time']=$request->notice_post_time;
$image=$request->file('notice_file');
if ($image) {
$image_name= str::random(5);
$ext=strtolower($image->getClientOriginalExtension());
$image_full_name=$image_name.'.'.$ext;
$upload_path='notices/';
$image_url=$upload_path.$image_full_name;
$success=$image->move($upload_path,$image_full_name);
if ($success) {
$data['notice_file']=$image_url;
$notices = DB::table('notices')
->insertGetId($data);
$notice = Notice::find($notices);
$teacher = Teacher::find($notice->teacher_id);
$users = User::all();
event(new NoticeAnnouncement($notice,$teacher,$users));
if ($notices) {
$notification=array(
'message'=>'Notice Posted Successfully','alert-type'=>'success'
);
return Redirect()->back()->with($notification);
}else{
$notification=array(
'message'=>'Could not be able to post the Notice','alert-type'=>'error'
);
return Redirect()->back()->with($notification);
}
}else{
return Redirect()->back();
}
}else{
$notice = DB::table('notices')
->insert($data);
if ($notice) {
$notification=array(
'message'=>'Notice Posted Successfully','alert-type'=>'success'
);
return Redirect()->back()->with($notification);
}else{
$notification=array(
'message'=>'Could not be able to post the Notice','alert-type'=>'error'
);
return Redirect()->back()->with($notification);
}
}
}
这是我的活动:
public $notice,$user;
/**
* Create a new event instance.
*
* @return void
*/
public function __construct(Notice $notice,Teacher $teacher,User $user)
{
$this->notice = $notice;
$this->teacher = $teacher;
$this->user = $user;
}
这是我的听众:
public function handle(NoticeAnnouncement $event)
{
foreach ($event->user as $user) {
Mail::to($user->email)->send(new SendNotice($event->notice,$event->teacher,$event->user));
}
}
解决方法
您将用户集合发送到方法而不是用户模型:
Mail::to($user->email)->send(new SendNotice($event->notice,$event->teacher,$user));
,
您使用 find($key)
函数从 Illuminate\Database\Eloquent\Model
获取 \Illuminate\Database\Eloquent\Collection
。
public function handle(NoticeAnnouncement $event)
{
foreach ($event->users as $key => $user) {
Mail::to($user->email)->send(new SendNotice($event->notice,$event->users->find($key)));
}
}
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