根据会话值选择实体 [英] Select entity based on session value

问题描述

我有两个实体.一个是 WebshopItem 实体，另一个是 WebshopPrice 实体.每次，您在创建一个 WebshopItem 的同时，也填写了 3 个 WebshopPrices.网上商店价格是 3 种货币(欧元、美元和英镑).

I got two entities. One is a WebshopItem entity, the other one is a WebshopPrice entity. Each time, you are creating a WebshopItem, you are also filling in 3 WebshopPrices. The WebshopPrices are 3 currencies (EUR, USD and GBP).

根据您选择的货币(并保存在您的会话中)，我想显示您选择的货币.所以，如果你选择了 EUR，我当然想显示 EUR 的价格.

Based on the currency you selected (and is saved in your session) I want to display the currency you selected. So, if you picked EUR, I of course want to display the EUR price.

在 symfony 中执行此操作的一般方法是什么?我应该根据会话中的内容使用从 WebshopItem 对象返回价格的树枝扩展吗?我应该已经从数据库中过滤 WebshopPrices 了吗?

What's the general way of doing this in symfony? Should I use a twig extension which returns the price from the WebshopItem object, based on what's in your session? Should I already filter the WebshopPrices from the database?

期待您的最佳解决方案.谢谢！

Looking forward to your best solutions. Thanks!

实体/WebshopItem.php

Entity/WebshopItem.php

class WebshopItem
{
   /**
   * @var \Doctrine\Common\Collections\Collection
   */
   private $prices;

   etc....
}

实体/WebshopItemPrice.php

Entity/WebshopItemPrice.php

class WebshopItemPrice
{

   /**
   * @var integer
   */
   private $id;

   /**
   * @var string
   */
   private $currency;

   /**
   * @var string
   */
   private $price;

   private $webshopItem;
}

推荐答案

UPDATE

您可以使用实体侦听器也是，但在这种情况下，您需要覆盖默认解析器以在您的侦听器中获取会话:

You can use an entity listener too, but in that case you'll need to override the default resolver to get the session in your listener:

src/Your/GreatBundle/Resources/config/services.yml

doctrine.orm.default_entity_listener_resolver:
        class: Your\GreatBundle\Listener\EntityListenerResolver
        arguments: [@service_container]

src/Your/GreatBundle/Listener/EntityListenerResolver

namespace Your\GreatBundle\Listener;

use Doctrine\ORM\Mapping\EntityListenerResolver as EntityListenerResolverInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

class EntityListenerResolver implements EntityListenerResolverInterface
{
    private $instances = [];
    private $container;

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    public function clear($className = null)
    {
        if ($className === null) {

            $this->instances = [];

            return;
        }

        if (isset($this->instances[$className = trim($className, '\\')])) {

            unset($this->instances[$className]);
        }
    }

    public function register($object)
    {
        if ( ! is_object($object)) {

            throw new \InvalidArgumentException(sprintf('An object was expected, but got "%s".', gettype($object)));
        }

        $this->instances[get_class($object)] = $object;
    }

    public function resolve($className)
    {
        if (isset($this->instances[$className = trim($className, '\\')])) {

            return $this->instances[$className];
        }

        // Here we are injecting the entire container to the listeners
        return $this->instances[$className] = new $className($this->container);
    }
}

<小时>

您可能会听到 Doctrine 的 postLoad 事件在注入用户会话的服务中:

---

You might listen to the Doctrine's postLoad event in a service injected with the user's session:

src/Your/GreatBundle/Resources/config/services.yml

services:
    price.listener:
        class: Your\GreatBundle\Listener\PriceListener
        arguments: [@session]
        tags:
            - { name: doctrine.event_listener, event: postLoad }

src/Your/GreatBundle/Listener/PriceListener.php

namespace Your\GreatBundle\Listener\PriceListener;

use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Doctrine\ORM\Event\LifecycleEventArgs;
use Your\GreatBundle\Entity\WebshopItem;

class PriceListener
{
    private $session;

    public function __construct(SessionInterface $session)
    {
        $this->session = $session;
    }

    public function postLoad(LifecycleEventArgs $event)
    {
        $entity = $event->getEntity();

        if ($entity instanceof WebshopItem) {

            $currency = $this->session->get('currency', 'EUR');
            $entity->setCurrency(currency);
        }
    }
}

src/Your/GreatBundle/Entity/WebshopItem.php

namespace Your\GreatBundle\Entity;

class WebshopItem
{
   ...

   // You don't need to persist this...
   private $currency = 'EUR';

   public function setCurrency($currency)
   {
        $this->currency = $currency;
   }

   public function getPrice()
   {
        foreach ($this->prices as $price) {

            if ($price->getCurrency() === $this->currency) {

                return ($price->getPrice();
            }
        }

        return null;
   }
}

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