how can i handle this error : Undefined offset: 0 - php

Question

I'm producing an online school platform and in part of it student can see it's classes with their informations..but the related function return this error : Undefined offset: 0 (View: C:\xampp\htdocs\OnlineSchool\resources\views\admin\student\ClassReport.blade.php)
there are some relations between models
My Models:
USER(students and teachers) ، LEVEL(level of classes) ، Classroom.
=> there is a many to many relation between student and classroom (pivot table)
please save me from this stupid error
user:
class User extends Authenticatable
{
use Notifiable;
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'name', 'email', 'password','image','level','code_meli',
];
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'password', 'remember_token',
];
/**
* The attributes that should be cast to native types.
*
* #var array
*/
protected $casts = [
'email_verified_at' => 'datetime',
];
public function classroom(){
return $this->hasMany (classroom::class);
}
public function ClassRoomStudent(){
return $this->belongsToMany (classroom::class ,'classroom_user','user_id','classroom_id');
}
}
classroom:
class classroom extends Model
{
protected $fillable = [
'title', 'teacher_id', 'level_id','day','time','price',
];
public function Student(){
return $this->belongsToMany (user::class ,'classroom_user','classroom_id','user_id');
}
public function level(){
return $this->belongsTo (level::class );
}
public function teacher(){
return $this->belongsTo (user::class );
}
}
level :
class level extends Model
{
protected $fillable = [
'title',
];
public function classroom(){
return $this->hasMany (classroom::class);
}
public function exam(){
return $this->hasMany (exam::class);
}
}
and my function in controller:
public function MyClasses(){
$student_id=auth ()->user ()->id;
$classrooms=classroom::with ('level','teacher','factor')->wherehas('student',function ($q) use($student_id){
$q->where('id',$student_id);
})->get();
return view ('admin.student.ClassReport',compact ('classrooms','student_id'));
}
at the end .. my blade:
#foreach($classrooms as $class)
<tr>
<td>{{$i++}}</td>
<td>{{$class->title}}</td>
<td>{{$class->teacher[0]->name}}</td>
.
.
.
.
</tr>
#endforeach

Answer 1

The Classroom belongs to only one teacher, no need to use de zero index, just type $class->teacher->name