将日期时间和对象转换为字符串 (doctrine, symfony)

Question

我想将更改写入数据库，但我总是收到错误消息：

Catchable Fatal Error: Object of class DateTime could not be converted to string

我使用 getEntityChangeSet() 收到实体的更改，然后我想将数据解析为可读格式，然后将其写入 db:

$changes = $uow->getEntityChangeSet($entity);
        $log='';
        foreach ($changes as $key=>$change)
        {
            $log.= "{$key} => Old Value:{$change[0]} => New Value:{$change[1]}";
        }

如果我不尝试向 change_set 字段写入类似这样的可读数据原则：

a:3:{s:5:"value";a:2:{i:0;N;i:1;s:3:"120";}s:4:"item";a:2:{i:0;N;i:1;O:21:"AppBundle\Entity\Item":6:{s:25:"AppBundle\Entity\Itemid";i:127;s:27:"AppBundle\Entity\Itemname";s:7:"newitem";s:13:"*categories";O:33:"Doctrine\ORM\PersistentCollection":2:{s:13:"*collection";O:43:"Doctrine\Common\Collections\ArrayCollection":1:{s:53:"Doctrine\Common\Collections\ArrayCollectionelements";a:2:{i:0;O:25:"AppBundle\Entity\Category":7:{s:29:"AppBundle\Entity\Categoryid";i:2;s:31:"AppBundle\Entity\Categoryname";s:10:"child to 1";s:33:"AppBundle\Entity\Categoryparent";O:40:"Proxies__CG__\AppBundle\Entity\Category":8:{s:17:"isInitialized";b:0;s:29:"AppBundle\Entity\Categoryid";i:1;s:31:"AppBundle\Entity\Categoryname";N;s:33:"AppBundle\Entity\Categoryparent";N;s:35:"AppBundle\Entity\Categorychildren";N;s:8:"*items";N;s:36:"AppBundle\Entity\CategorycreatedAt";N;s:36:"AppBundle\Entity\CategoryupdatedAt";N;}s:35:"AppBundle\Entity\Categorychildren";O:33:"Doctrine\ORM\PersistentCollection":2:{s:13:"*collection";O:43:"Doctrine\Common\Collections\ArrayCollection":1:{s:53:"Doctrine\Common\Collections\ArrayCollectionelements";a:0:{}}s:14:"*initialized";b:0;}s:8:"*items";O:33:"Doctrine\ORM\PersistentCollection":2:{s:13:"*collection";O:43:"Doctrine\Common\Collections\ArrayCollection":1:{s:53:"Doctrine\Common\Collections\ArrayCollectionelements";a:0:{}}s:14:"*initialized";b:0;}s:36:"AppBundle\Entity\CategorycreatedAt";N;s:36:"AppBundle\Entity\CategoryupdatedAt";N;}i:1;O:25:"AppBundle\Entity\Category":7:{s:29:"AppBundle\Entity\Categoryid";i:4;s:31:"AppBundle\Entity\Categoryname";s:8:"child1.1";s:33:"AppBundle\Entity\Categoryparent";r:13;s:35:"AppBundle\Entity\Categorychildren";O:33:"Doctrine\ORM\PersistentCollection":2:{s:13:"*collection";O:43:"Doctrine\Common\Collections\ArrayCollection":1:{s:53:"Doctrine\Common\Collections\ArrayCollectionelements";a:0:{}}s:14:"*initialized";b:0;}s:8:"*items";O:33:"Doctrine\ORM\PersistentCollection":2:{s:13:"*collection";O:43:"Doctrine\Common\Collections\ArrayCollection":1:{s:53:"Doctrine\Common\Collections\ArrayCollectionelements";a:0:{}}s:14:"*initialized";b:0;}s:36:"AppBundle\Entity\CategorycreatedAt";N;s:36:"AppBundle\Entity\CategoryupdatedAt";N;}}}s:14:"*initialized";b:1;}s:13:"*attributes";N;s:32:"AppBundle\Entity\ItemcreatedAt";O:8:"DateTime":3:{s:4:"date";s:26:"2018-03-19 10:22:47.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:3:"UTC";}s:32:"AppBundle\Entity\ItemupdatedAt";N;}}s:9:"attribute";a:2:{i:0;N;i:1;O:26:"AppBundle\Entity\Attribute":3:{s:30:"AppBundle\Entity\Attributeid";i:96;s:33:"AppBundle\Entity\Attributealias";s:5:"price";s:32:"AppBundle\Entity\Attributename";s:5:"price";}}}

知道如何将日期和其他对象转换为字符串吗？或者我需要使用其他方法来解决这个问题？

Answer 1

首先检查该值是否为\DateTime对象，然后进行转换。

...
if ($change[0] instanceof \DateTime) {
    $stringValue = $value->format('Y-m-d H:i:s');
}
// Do the same for $change[1]
...

将日期时间和对象转换为字符串 (doctrine, symfony)

Convert datetime and objects to string (doctrine, symfony)

php

entity

data-conversion

symfony

doctrine-orm