学说抛出例外"Fatal error: Call to a member function add() on a non-object"

Question

我无法弄清楚为什么我的协会不起作用。

我遇到的错误如下：

Fatal error: Call to a member function add() on a non-object in http://localhost/Projects/clariture/app/src/Clariture/Controllers/ChannelController.php on line 48

我的代码如下：

<?php
namespace ClaritureClasses;
class Entity {
    /**
     * @Id @Column(type="integer")
     * @GeneratedValue
     */
    protected $id;
    /**
     * @Column(type="integer")
     */
    protected $dateCreated = 0;
    /**
     * @Column(type="integer")
     */
    protected $dateUpdated = 0;
    /**
     * @param string $name
     */
    public function __get($name)
    {
        return $this->$name;
    }
    /**
     * @param string $name
     * @param mixed $value
     */
    public function __set($name, $value) {
        $this->$name = $value;
    }
}
<?
namespace ClaritureEntities;
/**
 * @Entity
 * @Table(name="Channels")
 */
class Channel extends ClaritureClassesEntity {
    /**
     * @Column(type="string", length=140)
     */
    protected $name;
    /**
     * @Column(type="string", length=255)
     */
    protected $type;
    /**
     * @Column(type="string", length=255)
     */
    protected $token;
    /**
     * @OneToMany(targetEntity="ServiceLine", mappedBy="channels")
     */
    protected $serviceLine;
}
<?
namespace ClaritureEntities;
/**
 * @Entity
 * @Table(name="ServiceLines")
 */
class ServiceLine extends ClaritureClassesEntity {
    /**
     * @Column(type="string", length=140)
     */
    protected $name;
    /**
     * @Column(type="string", length=45)
     */
    protected $code;
    /**
     * @Column(type="boolean")
     */
    protected $active;
    /**
     * @ManyToOne(targetEntity="Channel", inversedBy="serviceLine")
     */
    protected $channels;
    /**
     * @OneToMany(targetEntity="Group", mappedBy="serviceLines")
     **/
    protected $group;
    public function __construct() {
        $this->channels = new DoctrineCommonCollectionsArrayCollection();
    }
}
<?php
namespace ClaritureControllers;
use SilexApplication;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationJsonResponse;
class ChannelController extends ClaritureClassesController {
    public $roles = [_USER_ROLE_ADMIN];
    public function create($channelType) {
        $accessToken = $this->request->get('accessToken');
        $serviceLineId = $this->request->get('serviceLineId');
        $groupId = $this->request->get('groupId');
        $this->monolog->addDebug('accessToken: ' . $accessToken);
        $this->monolog->addDebug('serviceLineId: ' . $serviceLineId);
        $name = null;
        /* get the extended access token */
        switch($channelType) {
            default:
            case _CHANNEL_TYPE_FACEBOOK:
                $this->facebook->setAccessToken($accessToken);
                $this->facebook->setExtendedAccessToken();
                $accessToken = $this->facebook->getAccessToken();
                $user = $this->facebook->api('/me');
                $name = $user['name'];
            break;
        }
        $group = $this->em->find('ClaritureEntitiesGroup', $groupId);     
        $serviceLine = $this->em->find('ClaritureEntitiesServiceLine', $serviceLineId);
        $channel = new ClaritureEntitiesChannel;
        $channel->token = $accessToken;
        $channel->type = $channelType;
        $channel->name = $name;
        $channel->serviceLine = $serviceLine;
        $channel->group = $group;
        $channel->dateCreated = time();
        $serviceLine->channels->add($channel);
        $group->channels->add($channel);
        // $this->monolog->addDebug('serviceLine: ' . print_r($serviceLine, 1));
        $this->em->persist($channel);
        $this->em->flush();
    }
<?php
namespace ClaritureEntities;
use DoctrineCommonCollectionsArrayCollection;
/**
 * @Entity
 * @Table(name="groups")
 */
class Group extends ClaritureClassesEntity {
    /**
     * @Id @Column(type="integer")
     * @GeneratedValue
     */
    protected $id;
    /**
     * @Column(type="string", unique=true, length=140)
     */
    protected $name;
    /**
     * @OneToMany(targetEntity="Group", mappedBy="parent")
     **/
    private $children;
    /**
     * @ManyToOne(targetEntity="Group", inversedBy="children")
     * @JoinColumn(name="parent_id", referencedColumnName="id")
     **/
    private $parent;
    /**
     * @ManyToOne(targetEntity="ServiceLine", inversedBy="group")
     **/
    protected $serviceLines;
    /**
     * @ManyToOne(targetEntity="Channel", inversedBy="group")
     **/
    protected $channels;
    public function __construct() {
        $this->children = new DoctrineCommonCollectionsArrayCollection();
        $this->channels = new DoctrineCommonCollectionsArrayCollection();
    }
}

Answer 1

尝试将构造函数添加到实体服务和组中，该构建器初始化了$ channels参数以使用Doctrine common collections arrayCollection。这样：

use DoctrineCommonCollectionsArrayCollection;
public function __constructor()
{
    $this->channels = new ArrayCollection();
}