Symfony3 + Doctrine Example

Article.php

<?php
// AppBundle/Entity/Article.php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Author;

/**
 * @ORM\Entity
 * @ORM\Table(name="articles")
 */
class Article
{
    /**
     * @ORM\Column(type="integer", name="id")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(type="string", name="title", length=100, nullable=false)
     */
    protected $title;

    /**
     * @ORM\Column(type="text", name="content")
     */
    protected $content;

    /**
     * @var Author
     *
     * @ORM\ManyToOne(targetEntity="Author")
     * @ORM\JoinColumn(name="author_id", referencedColumnName="id")
     */
    protected $author;

    /**
     * @return mixed
     */
    public function getId()
    {
        return $this->id;
    }


    /**
     * @return mixed
     */
    public function getTitle()
    {
        return $this->title;
    }

    /**
     * @param mixed $title
     * @return Article
     */
    public function setTitle($title)
    {
        $this->title = $title;
        return $this;
    }

    /**
     * @return mixed
     */
    public function getContent()
    {
        return $this->content;
    }

    /**
     * @param mixed $content
     * @return Article
     */
    public function setContent($content)
    {
        $this->content = $content;
        return $this;
    }

    /**
     * @return Author
     */
    public function getAuthor()
    {
        return $this->author;
    }

    /**
     * @param Author $author
     * @return Article
     */
    public function setAuthor(Author $author)
    {
        $this->author = $author;
        return $this;
    }
}

Author.php

<?php
// AppBundle/Entity/Author.php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="authors")
 */
class Author
{
    /**
     * @ORM\Column(type="integer", name="id")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(type="string", name="name", length=100, nullable=false)
     */
    protected $name;

    /**
     * @return mixed
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @return mixed
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * @param mixed $name
     * @return Author
     */
    public function setName($name)
    {
        $this->name = $name;
        return $this;
    }
}

DefaultController.php

<?php
// AppBundle/Controller/DefaultController.php
namespace AppBundle\Controller;

use AppBundle\Entity\Article;
use AppBundle\Entity\Author;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class DefaultController extends Controller
{
    /**
     * 編輯文章和作者
     *
     * @Route("/edit/{id}", name="edit", requirements={"id"="\d+"}, defaults={"id"=0})
     *
     * @param Request $request
     * @param int $id
     *
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function editAction(Request $request, $id = 0)
    {
        // 取得 Entity Manager 物件
        $em = $this->getDoctrine()->getEntityManager();

        if ($id > 0) {
            $article = $em->getRepository(Article::class)->find($id);
        }

        // 處理 Form 表單送出的資料
        if ($request->isMethod('POST')) {
            $articleData = $request->request->get('article', []);
            $authorData = $request->request->get('author', []);

            // TODO: 要做一些資料驗證
            // 資料驗證這步驟先跳過，先假設帶入的資料都正確

            if (empty($article)) {
                // 新增資料的情形時，新增 Author 和 Article 物件
                $author = new Author();
                $article = new Article();

                // 建立 Article 和 Author 的關聯
                $article->setAuthor($author);
            } else {
                // 編輯資料的情形時，從 Article 物件取得 Author 物件
                $author = $article->getAuthor();
            }

            $article->setTitle($articleData['title']);
            $article->setContent($articleData['content']);
            $author->setName($authorData['name']);

            $em = $this->getDoctrine()->getManager();

            // 先 persist Author 物件， 再 persist Article 物件，確保關聯的正確性
            $em->persist($author);
            $em->persist($article);
            $em->flush();

            // 更新成功後，重新導向到編輯頁
            return $this->redirect($this->generateUrl('edit', ['id' => $article->getId()]));
        }

        if (empty($article)) {
            $article = new Article();
            $article->setAuthor(new Author());
        }

        return $this->render('AppBundle:Default:edit.html.twig', ['article' => $article]);
    }
}

edit.html.twig

{# AppBundle/Resources/views/Default/edit.html.twig #}
<html>
<body>
<form method="post">
    <input type="hidden" name="article[id]" value="{{ article.id }}" />
    <input type="hidden" name="author[id]" value="{{ article.author.id }}" />
    Article title: <input name="article[title]" value="{{ article.title }}" />
    <br>
    Article content: <textarea name="article[content]">{{ article.content }}</textarea>
    <br>
    Author: <input name="author[name]" value="{{ article.author.name }}" />
    <br>
    <button>Submit</button>
</form>
</body>
</html>