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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace App\Controller;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Cake\Network\Exception\NotFoundException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class NotificationsController extends AppController  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Initialization hook method.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function initialize()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        parent::initialize();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->loadComponent('RequestHandler'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Mark a notification as readed.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void|\Cake\Network\Response  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function markAsRead()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$this->request->is('ajax')) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new NotFoundException();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->Notifications = $this->loadModel('Notifications'); | 
            
                            
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                        $json = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'error' => false  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $notification = $this->Notifications  | 
            
                            
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                            ->find()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->where([  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'id' => $this->request->data['id']  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->first();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($notification->is_read) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->set(compact('json')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->set('_serialize', 'json'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        //If the notification doesn't exist or if the owner of the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        //notification is not the current user, return an error.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_null($notification) || $notification->user_id != $this->Auth->user('id')) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $json['error'] = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->set(compact('json')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->set('_serialize', 'json'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $notification->is_read = 1;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->Notifications->save($notification);  | 
            
                            
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                        $this->set(compact('json')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->set('_serialize', ['json']); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Since your code implements the magic setter
_set, this function will be called for any write access on an undefined variable. You can add the@propertyannotation to your class or interface to document the existence of this variable.Since the property has write access only, you can use the @property-write annotation instead.
Of course, you may also just have mistyped another name, in which case you should fix the error.
See also the PhpDoc documentation for @property.