Doctrine2 将实体导出到数组

问题描述

我有 Product 实体与多对一到 Category 实体.我需要在会话中存储 Product.首先，我尝试在 Product 上实现 Serializable 接口.我应该如何序列化我的相关 Category 实体?我还应该实现 Serializable 接口吗?

I have Product entity with many-to-one to Category entity. I need store Product in session. First of all i try to implement Serializable interface on Product. How should i serialize my related Category entity? Should i also implement Serializable interface?

我读到，学说中的序列化是非常痛苦的操作，我想到了这一点:

I read, that serialization in doctrine is very pain operation and i think about this:

我们可以从实体中获取原始值吗?正是存储在数据库中的数据.如果我们能得到这个值，我们就可以将它存储在任何地方并重新创建对象！

Can we get raw values from entity? Exactly that data, which stored in database. If we can get this values, we can store it anywhere and recreate object!

我阅读了doctrine2 代码并找到了DoctrineORMInternalHydrationObjectHydrator:hydraRowData 方法，但它受到了保护.有没有公​​开的 api 来做这件事?

I read doctrine2 code and find method DoctrineORMInternalHydrationObjectHydrator:hydrateRowData but it's protected. Is there any public api for doing this?

我只是从 BasicEntityPersister 复制粘贴并集成了一些代码，它似乎可以工作.

I just copypaste and integrate some code from BasicEntityPersister and it seems to work.

    $product = $productsRepository->find($id);

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

    $uow = $em->getUnitOfWork();
    $entityPersister = $uow->getEntityPersister(get_class($product));
    $classMetadata = $entityPersister->getClassMetadata();

    $originalData = $uow->getOriginalEntityData($product);

    $result = array();
    foreach ($originalData as $field => $value) {
        if (isset($classMetadata->associationMappings[$field])) {
            $assoc = $classMetadata->associationMappings[$field];

            // Only owning side of x-1 associations can have a FK column.
            if ( ! $assoc['isOwningSide'] || ! ($assoc['type'] & DoctrineORMMappingClassMetadata::TO_ONE)) {
                continue;
            }

            if ($value !== null) {
                $newValId = $uow->getEntityIdentifier($value);
            }

            $targetClass = $em->getClassMetadata($assoc['targetEntity']);
            $owningTable = $entityPersister->getOwningTable($field);

            foreach ($assoc['joinColumns'] as $joinColumn) {
                $sourceColumn = $joinColumn['name'];
                $targetColumn = $joinColumn['referencedColumnName'];

                if ($value === null) {
                    $result[$owningTable][$sourceColumn] = null;
                } else if ($targetClass->containsForeignIdentifier) {
                    $result[$owningTable][$sourceColumn] = $newValId[$targetClass->getFieldForColumn($targetColumn)];
                } else {
                    $result[$owningTable][$sourceColumn] = $newValId[$targetClass->fieldNames[$targetColumn]];
                }
            }
        } elseif (isset($classMetadata->columnNames[$field])) {
            $columnName = $classMetadata->columnNames[$field];
            $result[$entityPersister->getOwningTable($field)][$columnName] = $value;
        }
    }

    print_r($result);

在 $result 我们有原始值.现在我们需要方法如何通过这个数组创建对象

In $result we have raw values. Now we need way how to create object by this array

推荐答案

<?php

namespace AcmeServiceBundleServices;

use DoctrineORMEntityManager;

class EntitySerializer
{
    protected $em;

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
    }

    public function serialize($entity)
    {
        $className = get_class($entity);

        $uow = $this->em->getUnitOfWork();
        $entityPersister = $uow->getEntityPersister($className);
        $classMetadata = $entityPersister->getClassMetadata();

        $result = array();
        foreach ($uow->getOriginalEntityData($entity) as $field => $value) {
            if (isset($classMetadata->associationMappings[$field])) {
                $assoc = $classMetadata->associationMappings[$field];

                // Only owning side of x-1 associations can have a FK column.
                if ( ! $assoc['isOwningSide'] || ! ($assoc['type'] & DoctrineORMMappingClassMetadata::TO_ONE)) {
                    continue;
                }

                if ($value !== null) {
                    $newValId = $uow->getEntityIdentifier($value);
                }

                $targetClass = $this->em->getClassMetadata($assoc['targetEntity']);
                $owningTable = $entityPersister->getOwningTable($field);

                foreach ($assoc['joinColumns'] as $joinColumn) {
                    $sourceColumn = $joinColumn['name'];
                    $targetColumn = $joinColumn['referencedColumnName'];

                    if ($value === null) {
                        $result[$sourceColumn] = null;
                    } else if ($targetClass->containsForeignIdentifier) {
                        $result[$sourceColumn] = $newValId[$targetClass->getFieldForColumn($targetColumn)];
                    } else {
                        $result[$sourceColumn] = $newValId[$targetClass->fieldNames[$targetColumn]];
                    }
                }
            } elseif (isset($classMetadata->columnNames[$field])) {
                $columnName = $classMetadata->columnNames[$field];
                $result[$columnName] = $value;
            }
        }

        return array($className, $result);
    }

    public function deserialize(Array $data)
    {
        list($class, $result) = $data;

        $uow = $this->em->getUnitOfWork();
        return $uow->createEntity($class, $result);
    }
}

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