Laravel Method notify does not exist - php

Question

I am trying to notify user if a new form is inserted to database, but I get this error:
BadMethodCallException in Macroable.php line 74: Method notify does not exist.
This is the notification class
<?php
namespace App\Notifications\Admin;
use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use App\Models\Admin\Forms\Prescriptions;
class PrescriptionNotification extends Notification
{
use Queueable;
public $Prescription;
/**
* Create a new notification instance.
*
* #return void
*/
public function __construct(Prescriptions $Prescription)
{
$this->Prescriptions = $Prescription;
}
/**
* Get the notification's delivery channels.
*
* #param mixed $notifiable
* #return array
*/
public function via($notifiable)
{
return ['database'];
}
/**
* Get the mail representation of the notification.
*
* #param mixed $notifiable
* #return \Illuminate\Notifications\Messages\MailMessage
*/
public function toMail($notifiable)
{
$url = url('/admin/prescriptions/edit/'.$this->Prescriptions->id);
return (new MailMessage)
->line('New form')
->action('View', $url)
->line('');
}
/**
* Get the array representation of the notification.
*
* #param mixed $notifiable
* #return array
*/
public function toArray($notifiable)
{
return [
'test' => 'test'
];
}
}
And in my controller I am doing this:
$users = App\User::all()->where('role', 3);
//trigger email notification
$Prescription = Prescriptions::first();
$users->notify(new PrescriptionNotification($Prescription));
Been following This tutorial, but still to no avail. I have Notifiable in the user model. What else can be done? I am losing my mind what causes this error.
As requested my User class:
<?php
namespace App;
use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
class User extends Authenticatable
{
use Notifiable;
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'name', 'email', 'password',
];
/**
* The attributes that should be hidden for arrays.
*
* #var array
*/
protected $hidden = [
'password', 'remember_token',
];
//is admin
public function isAdmin()
{
return $this->role; // this looks for an admin column in your users table
}
//relationship with prescription forms
public function confirmations()
{
return $this->hasMany('App\Models\Admin\Forms\Prescription_confirmations', 'physician_id');
}
//relationship with prescriptions forms
public function prescriptions()
{
return $this->hasMany('App\Models\Admin\Forms\Prescriptions', 'physician_id');
}
}

Answer 1

$users is a collection, so you are calling notify method on a collection which will lead to error. And the method notify only exist on user object instance.
You can do this
<?php
foreach ($users as $user) {
$user->notify(new PrescriptionNotification($Prescription));
}

Answer 2

Think it's easier to use Notification Facade.
Notification::send($users, new PrescriptionNotification($Prescription));
And you need to call Notification facade with use like this,
use Illuminate\Support\Facades\Notification;

Answer 3

Also, you can use higher-order messages:
$users->each->notify(new PrescriptionNotification($Prescription));

Answer 4

In my case I forgot to implement the Notifiable trait.
So you have a users class for example:
use Illuminate\Notifications\Notifiable;
class Users {
use Notifiable;
...
}