Symfony2，在另一个自定义类中使用/使用自定义类

Question

How to load/access a custom class in the custom class in Symfony 2 not using service container?

If i try to use the custom logger as shown below i am getting the error:

Catchable Fatal Error: Argument 1 passed to MeetingBundle\\Components\\LogWriter::__construct() must implement interface Symfony\\Component\\HttpKernel\\Log\\LoggerInterface, none given, called in C:\\Bitnami\\wampstack-5.6.20-0\\apache2\\htdocs\\sym\\just2\\src\\MeetingBundle\\Components\\Serializer\\Diff\\EventDiff.php on line 23 and defined

Stack Trace:

in src\MeetingBundle\Components\LogWriter.php at line 12  -
private $logger;
public function __construct( LoggerInterface $logger ) // here they show the error
{
    $this->logger = $logger;
} 

src\\MeetingBundle\\Components\\LogWriter.php

<?php

namespace MeetingBundle\Components;

use Symfony\Component\HttpKernel\Log\LoggerInterface;

class LogWriter
{

    private $logger;

    public function __construct( LoggerInterface $logger )
    {
        $this->logger = $logger;
    }

    public function log($msg)
    {
        $this->logger->log($msg);
    }
}

src\\MeetingBundle\\Components\\Serializer\\Diff\\Diff.php

<?php

namespace MeetingBundle\Components\Serializer\Diff;

//use MeetingBundle\Components\LogWriter;

class Diff 
{
    private $diffCluesArr; 
    private $name; 
    private $logWriter;

    public function __construct ($logger) {
        $this->name= ""; 
        $this->diffCluesArr = [];
        $this->logWriter = $logger; 
        //$this->logWriter = new $logWriter; //changed here 
    } 

    public function array_diff_str_o ( $arr1, $arr2, $str ) {
        $this->logWriter("<br> In Diff  function array_diff_str_o ");
   //...

src\\MeetingBundle\\Components\\Serializer\\Diff\\EventDiff.php

<?php

namespace MeetingBundle\Components\Serializer\Diff;

use MeetingBundle\Components\Serializer\Diff\Diff;
use MeetingBundle\Components\LogWriter;

/**
 * Event normalizer
 */
class EventDiff extends Diff
{
    private $diffCluesArr; 
    private $name; 
    private $logw;

    // does not work
   // public function __construct (LogWriter $logger) {
   //     $this->logw= $logger;
  //      parent::__construct($this->logw);

    public function __construct () {
        $this->logw = new LogWriter();
        parent::__construct($this->logw);    
        $this->logw("<br> In constructor of EventDiff");
        $this->name= "event"; 
        $this->diffCluesArr = array( 
                //1 means compare normally
                //2 means compare the values of the keys
                'id' => 1,
// ..

app\\config\\services.yml

services:
    meeting.logw:
        class:     MeetingBundle\Components\LogWriter
        arguments: ["@logger"]

    meeting.diff.diff:
        class:     'MeetingBundle\Components\Serializer\Diff\Diff' 
        arguments: ["@meeting.logw"]

    meeting.diff.event:
        class: 'MeetingBundle\Components\Serializer\Diff\EventDiff'
        parent: meeting.logw
        #the same error: parent: meeting.diff.diff

src\\MeetingBundle\\Controller\\EventMapController.php

//.. 
    $diffentiator = $this->get('meeting.diff.event');
    $diffentiator->array_diff_str_o( $arrEventOld, $arrEventNew, $msg );
//..

---

//**** THE OLD VERSION OF THE QUESTION

If i try to use the custom logger as shown below i am getting the error:

Catchable Fatal Error: Argument 1 passed to MeetingBundle\\Components\\Serializer\\Diff\\Diff::__construct() must be an instance of MeetingBundle\\Components\\Serializer\\Diff\\LoggerInterface, none given, called in C:\\Bitnami\\wampstack-5.6.20-0\\apache2\\htdocs\\sym\\just2\\src\\MeetingBundle\\Components\\Serializer\\Diff\\EventDiff.php on line 16 and defined

Where is the mistake? The code is as follow:

just2\\src\\MeetingBundle\\Components\\LogWriter.php

<?php

namespace MeetingBundle\Components;

use Symfony\Component\HttpKernel\Log\LoggerInterface;

class LogWriter
{

    private $logger;

    public function __construct(LoggerInterface $logger) // the place of error
    {
        $this->logger = $logger;
    }

    public function log($msg)
    {
        $this->logger->log($msg);
    }
}

just2\\src\\MeetingBundle\\Components\\Serializer\\Diff\\Diff.php

<?php

namespace MeetingBundle\Components\Serializer\Diff;

use MeetingBundle\Components\LogWriter;

class Diff 
{
    private $logWriter;

    public function __construct (LoggerInterface $logger) {
      //  the first mistake
        $this->logWriter = $logger;
    }

    public function array_diff_str_o ( $arr1, $arr2, $str ) {
        $this->logWriter("<br> In Diff  function array_diff_str_o "); 
    //.. 
}

// src\\MeetingBundle\\Components\\Serializer\\Diff\\EventDiff.php

<?php

namespace MeetingBundle\Components\Serializer\Diff;

use MeetingBundle\Components\Serializer\Diff\Diff;
/** Provides clue how to calculate the differences between entities instances */
class EventDiff extends Diff
{
   private $diffCluesArr; 
   private $name; 

    public function __construct () {
        parent::__construct();
        $this->logWriter("<br> In constructor of EventDiff");
        $this->name= "event"; 
        $this->diffCluesArr = array( 
                //1 means compare normally
                //2 means compare the values of the keys
                'id' => 1,
//...

just2\\src\\MeetingBundle\\Controller\\EventMapController.php

    /** * @Route("/edit/{id}", name="event_jsMap_edit")
     * @Method("GET|POST")
     * @Template("MeetingBundle:Event:ev_jsMap_edit.html.twig")
     */
    public function editAction($id, Request $request)
    {
...
$diffentiator = $this->get('meeting.diff.event');
$diffentiator->array_diff_str_o( $arrEventOld, $arrEventNew, $msg ); 
...

I also made logwrite to be a service, but maybe it is not necessary and i do not want it to be a service. I would like to use it as a individual class not as a part of a service container: app\\config\\services.yml

services:
    events.logger:
        class:     MeetingBundle\Components\LogWriter
        arguments: ["@logger"]

    meeting.diff.event:
        class: 'MeetingBundle\Components\Serializer\Diff\EventDiff'

    #class Diff is not a service. Class EventDiff extends from Diff.

Answer 1

The problem is most likely in the way you instantiate Diff in EventDiff class as the error message suggests. LogWriter seems allright.

Do you define EventDiff as a service as well with correct dependencies?

Edit: In EventDiff you're calling parent::__construct(); without any parameter. However the parent Diff class takes one parameter. You probably want to inject a service to EventDiff that'll be passed to its parent in the constructor.

Answer 2

You could Manage Common Dependencies with Parent Services . Try defining the service defining the parent attribute in the following manner:

services:
    events.logger:
        class:     MeetingBundle\Components\LogWriter
        arguments: ["@logger"]

    meeting.diff.event:
        class: 'MeetingBundle\Components\Serializer\Diff\EventDiff'
        parent: events.logger

Hope this help