如何从symfony2中删除一个实体 [英] How do I delete an entity from symfony2

问题描述

我的第一个symfony2项目是存储在数据库中的客人列表（邀请在事件中）。我有

My first symfony2 project is a list of guests (invited in an event) stored in a database. I have

• 创建了具有所有变量的实体类Guest（id，name，address，phone number等）


• 在mysql数据库中创建模式


• 创建了一个添加访客的路线到树枝模板


• 创建一个formType

• created the entity class Guest with all variables for them (id, name, address, phone number etc.)
• created the schema in the mysql db
• created a route for "adding a guest" to a twig template
• created a formType

，最后在Controller中创建一个createGuest方法，一切正常。

and finally a "createGuest" method in the Controller and everything works fine.

我无法从数据库中删除来宾。我已经阅读了网络上的每个教程，包括官方的Symfony2书;它所说的是：

I can't manage to remove a guest from the database. I have read every tutorial in the web, including the official Symfony2 book; all that it says is :

删除对象

删除一个对象非常相似，但需要调用实体管理器的remove（）方法：

$em->remove($product);
$em->flush();

它并没有说什么（甚至更新对象部分缺少文档）关于如何连接控制器deleteAction（$ id）和树枝模板。我想做的是使用viewGuests操作和viewGuests twig模板列出所有guest虚拟机，每个行旁边都有一个删除图标，您应该点击删除一个条目。简单，但我找不到任何文件，不知道从哪里开始。

It does not say anything more than that (even the "Update an object" section is missing documentation) on how to connect the controller deleteAction($id) with the twig template. What I want to do is to list all guests with a viewGuests action and a viewGuests twig template, having a delete icon next to every row, which you should click to delete an entry. Simple, but I cannot find any documentation and do not know where to start from.

public function deleteGuestAction($id)
    {
        $em = $this->getDoctrine()->getEntityManager();
        $guest = $em->getRepository('GuestBundle:Guest')->find($id);

        if (!$guest) {
            throw $this->createNotFoundException('No guest found for id '.$id);
        }

        $em->remove($guest);
        $em->flush();

        return $this->redirect($this->generateUrl('GuestBundle:Page:viewGuests.html.twig'));
    }

推荐答案

Symfony很聪明，要使 find（）本身：

Symfony is smart and knows how to make the find() by itself :

public function deleteGuestAction(Guest $guest)
{
    if (!$guest) {
        throw $this->createNotFoundException('No guest found');
    }

    $em = $this->getDoctrine()->getEntityManager();
    $em->remove($guest);
    $em->flush();

    return $this->redirect($this->generateUrl('GuestBundle:Page:viewGuests.html.twig'));
}

要发送控制器中的ID，请使用 { {path（'your_route'，{'id'：guest.id}）}}

To send the id in your controller, use {{ path('your_route', {'id': guest.id}) }}

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