我可以在 Sonata Admin 控制器中使用 prePersist/preUpdate 来保存多个对象吗？

我有这个Alias entity:

use Gedmo\Timestampable\Traits\TimestampableEntity;

class Alias
{
    use IdentifierAutogeneratedTrait;
    use TimestampableEntity;
    use ActiveTrait;

    /**
     * @var string
     * @ORM\Column(type="string", length=150)
     */
    private $name;

    /**
     * Command associated to the alias.
     *
     * @var Command[]
     * @ORM\ManyToMany(targetEntity="Command", mappedBy="aliases", cascade={"persist"})
     */
    private $commands;

    ...
}

我有这个管理控制器：

class AliasAdmin extends Admin
{
    protected function configureFormFields(FormMapper $formMapper)
    {
        $formMapper
            ->add('name', null, array('required' => true))
            ->add('active', null, array('required' => false));
    }

    ...

    public function prePersist($alias)
    {
        // remove extra white spaces
        $noWhiteSpaces = str_replace(' ', '', $alias->getName());
        // split into several names
        $aliasArr = explode(',', $noWhiteSpaces);
    }

    public function preUpdate($alias)
    {
        ...
    }
}

当我添加新的Alias在视图上 - 意思是表单本身 - 我可以在上面写一个值name输入字段例如：value1或者我可以写多个值，以逗号分隔：value1, value2, value3, value4。如果我只有一个值name当我提交表单时，字段不会有问题，但如果我有多个逗号分隔作为第二个示例，那么我应该检查它们prePersist/preUpdate方法以拆分它们并创建一个Alias per name，我该怎么做？如果你看一下prePersist方法你会看到我正在谈论的内容，更清楚地了解如何在新的名称中为每个名称创建新的别名$aliasArr，有什么帮助吗？

Update:TimestampableEntity 没有被处理，为什么？

在尝试了 @m-khalid-junaid 的解决方案后，由于以下原因，我以以下错误结束NOT NULL约束，但我不知道为什么。看一下代码：

class AliasAdminController extends Controller
{
    /**
     * {@inheritdoc}
     */
    public function createAction(Request $request = null)
    {
        // the key used to lookup the template
        $templateKey = 'edit';

        if (false === $this->admin->isGranted('CREATE')) {
            throw new AccessDeniedException();
        }

        $object = $this->admin->getNewInstance();
        $this->admin->setSubject($object);

        /** @var $form \Symfony\Component\Form\Form */
        $form = $this->admin->getForm();
        $form->setData($object);

        if ($this->getRestMethod() == 'POST') {
            $form->submit($this->get('request'));
            $isFormValid = $form->isValid();

            // persist if the form was valid and if in preview mode the preview was approved
            if ($isFormValid && (!$this->isInPreviewMode() || $this->isPreviewApproved())) {
                if (false === $this->admin->isGranted('CREATE', $object)) {
                    throw new AccessDeniedException();
                }

                try {
                    $aliasArr = $this->toStrings($object->getName());

                    if (count($aliasArr) > 1) {
                        $object->setName($aliasArr[0]);
                        $object = $this->admin->create($object);
                        unset($aliasArr[0]);
                        $entityManager = $this->getDoctrine()->getManager();

                        foreach ($aliasArr as $alias) {
                            $newAlias = new Alias();
                            $newAlias->setName($alias);
                            $entityManager->persist($newAlias);
                        }

                        $entityManager->flush();
                    } else {
                        $object = $this->admin->create($object);
                    }

                    if ($this->isXmlHttpRequest()) {
                        return $this->renderJson(array(
                            'result' => 'ok',
                            'objectId' => $this->admin->getNormalizedIdentifier($object),
                        ));
                    }

                    $this->addFlash(
                        'sonata_flash_success',
                        $this->admin->trans(
                            'flash_create_success',
                            array('%name%' => $this->escapeHtml($this->admin->toString($object))),
                            'SonataAdminBundle'
                        )
                    );

                    // redirect to edit mode
                    return $this->redirectTo($object);
                } catch (ModelManagerException $e) {
                    $this->logModelManagerException($e);
                    $isFormValid = false;
                }
            }

            // show an error message if the form failed validation
            if (!$isFormValid) {
                if (!$this->isXmlHttpRequest()) {
                    $this->addFlash(
                        'sonata_flash_error',
                        $this->admin->trans(
                            'flash_create_error',
                            array('%name%' => $this->escapeHtml($this->admin->toString($object))),
                            'SonataAdminBundle'
                        )
                    );
                }
            } elseif ($this->isPreviewRequested()) {
                // pick the preview template if the form was valid and preview was requested
                $templateKey = 'preview';
                $this->admin->getShow();
            }
        }

        $view = $form->createView();

        // set the theme for the current Admin Form
        $this->get('twig')->getExtension('form')->renderer->setTheme($view, $this->admin->getFormTheme());

        return $this->render($this->admin->getTemplate($templateKey), array(
            'action' => 'create',
            'form' => $view,
            'object' => $object,
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function editAction($id = null)
    {
        // the key used to lookup the template
        $templateKey = 'edit';

        $id = $this->get('request')->get($this->admin->getIdParameter());
        $object = $this->admin->getObject($id);

        if (!$object) {
            throw new NotFoundHttpException(sprintf('unable to find the object with id : %s', $id));
        }

        if (false === $this->admin->isGranted('EDIT', $object)) {
            throw new AccessDeniedException();
        }

        $this->admin->setSubject($object);

        /** @var $form \Symfony\Component\Form\Form */
        $form = $this->admin->getForm();
        $form->setData($object);

        if ($this->getRestMethod() == 'POST') {
            $form->submit($this->get('request'));

            $isFormValid = $form->isValid();

            // persist if the form was valid and if in preview mode the preview was approved
            if ($isFormValid && (!$this->isInPreviewMode() || $this->isPreviewApproved())) {
                try {
                    $aliasArr = $this->toStrings($object->getName());

                    if (count($aliasArr) > 1) {
                        $object->setName($aliasArr[0]);
                        $object = $this->admin->update($object);
                        unset($aliasArr[0]);
                        $entityManager = $this->getDoctrine()->getManager();

                        foreach ($aliasArr as $alias) {
                            $newAlias = new Alias();
                            $newAlias->setName($alias);
                            $entityManager->persist($newAlias);
                        }

                        $entityManager->flush();
                    } else {
                        $object = $this->admin->update($object);
                    }

                    if ($this->isXmlHttpRequest()) {
                        return $this->renderJson(array(
                            'result' => 'ok',
                            'objectId' => $this->admin->getNormalizedIdentifier($object),
                        ));
                    }

                    $this->addFlash(
                        'sonata_flash_success',
                        $this->admin->trans(
                            'flash_edit_success',
                            array('%name%' => $this->escapeHtml($this->admin->toString($object))),
                            'SonataAdminBundle'
                        )
                    );

                    // redirect to edit mode
                    return $this->redirectTo($object);
                } catch (ModelManagerException $e) {
                    $this->logModelManagerException($e);

                    $isFormValid = false;
                }
            }

            // show an error message if the form failed validation
            if (!$isFormValid) {
                if (!$this->isXmlHttpRequest()) {
                    $this->addFlash(
                        'sonata_flash_error',
                        $this->admin->trans(
                            'flash_edit_error',
                            array('%name%' => $this->escapeHtml($this->admin->toString($object))),
                            'SonataAdminBundle'
                        )
                    );
                }
            } elseif ($this->isPreviewRequested()) {
                // enable the preview template if the form was valid and preview was requested
                $templateKey = 'preview';
                $this->admin->getShow();
            }
        }

        $view = $form->createView();

        // set the theme for the current Admin Form
        $this->get('twig')->getExtension('form')->renderer->setTheme($view, $this->admin->getFormTheme());

        return $this->render($this->admin->getTemplate($templateKey), array(
            'action' => 'edit',
            'form' => $view,
            'object' => $object,
        ));
    }

    private function logModelManagerException($e)
    {
        $context = array('exception' => $e);
        if ($e->getPrevious()) {
            $context['previous_exception_message'] = $e->getPrevious()->getMessage();
        }
        $this->getLogger()->error($e->getMessage(), $context);
    }

    private function toStrings($string)
    {
        $noWhiteSpaces = str_replace(' ', '', $string);
        return explode(',', $noWhiteSpaces);
    }
}

这是错误：

[2016-02-28 11:10:36] doctrine.DEBUG: "START TRANSACTION" [] []
[2016-02-28 11:10:36] doctrine.DEBUG: INSERT INTO cm_alias (name, created_at, updated_at, active) VALUES (?, ?, ?, ?) {"1":"alias1","2":null,"3":null,"4":true} []
[2016-02-28 11:10:36] doctrine.DEBUG: "ROLLBACK" [] []
[2016-02-28 11:10:36] app.ERROR: Failed to create object: PlatformAdminBundle\Entity\Alias {"exception":"[object] (Sonata\\AdminBundle\\Exception\\ModelManagerException(code: 0): Failed to create object: PlatformAdminBundle\\Entity\\Alias at /var/www/html/platform.sonata/vendor/sonata-project/doctrine-orm-admin-bundle/Model/ModelManager.php:142, Doctrine\\DBAL\\Exception\\NotNullConstraintViolationException(code: 0): An exception occurred while executing 'INSERT INTO cm_alias (name, created_at, updated_at, active) VALUES (?, ?, ?, ?)' with params [\"alias1\", null, null, 1]:\n\nSQLSTATE[23000]: Integrity constraint violation: 1048 Column 'created_at' cannot be null at /var/www/html/platform.sonata/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:112, Doctrine\\DBAL\\Driver\\PDOException(code: 23000): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'created_at' cannot be null at /var/www/html/platform.sonata/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:93, PDOException(code: 23000): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'created_at' cannot be null at /var/www/html/platform.sonata/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:91)","previous_exception_message":"An exception occurred while executing 'INSERT INTO cm_alias (name, created_at, updated_at, active) VALUES (?, ?, ?, ?)' with params [\"alias1\", null, null, 1]:\n\nSQLSTATE[23000]: Integrity constraint violation: 1048 Column 'created_at' cannot be null"} []

Why TimestampableEntity新的管理控制器未处理特征？我在这里缺少什么？

如果您想添加具有不同别名的同一对象，最好创建一个CRUDController您的管理类的控制器，一旦您拥有 CRUDController，您就可以覆盖createAction & editAction基类并在此处实现您当前对象的逻辑 prePresist/preUpdate 事件，以便使用控制器为具有不同信息的对象创建副本。我在下面只提到了必要的代码，您可以从奏鸣曲的 CRUDController 复制并在中实现相同的逻辑editAction

public function createAction(Request $request = null)
{
    // .. some code here copy from base class
    try {
        $noWhiteSpaces = str_replace(' ', '', $object->getName());
        // split into several names
        $aliases = explode(',', $noWhiteSpaces);
        if (count($aliases) > 1) {
            $object->setName($aliases[0]);
            $object = $this->admin->create($object);
            unset($aliases[0]);
            $DM = $this->getDoctrine()->getManager();
            foreach ($aliases as $alias) {
                $newAlias = new Alias();
                $newAlias->setName($alias);
                $DM->persist($newAlias);
            }
            $DM->flush();
        } else {
            $object = $this->admin->create($object);
        }
    } catch (ModelManagerException $e) {
        $this->handleModelManagerException($e);

        $isFormValid = false;
    }
    // .. some code here copy from base class
}

编辑为created_at不为空错误

您需要在别名实体中定义一个构造函数，然后初始化您的createdAt财产与DateTime object

/**
 * Constructor
 */
public function __construct()
{
    $this->createdAt = new \DateTime('now');
}