Question

我在下面创建了这两个模型（作者和书籍），通过多对多的关系相关联。然后我生成了crud方法。

问题：当我尝试使用新表单或编辑表单创建或保存作者时，它不会保存书籍。

namespace Prueba\FrontendBundle\Entity;

use \Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;

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

    /**
     * @ORM\Column(type="string")
     */ 
    protected $name;

    /**
     * @ORM\ManyToMany(targetEntity="Book", inversedBy="authors")
     * @ORM\JoinTable(name="author_book")
     */
    protected $books;

    public function __construct()
    {
        $this->books = new ArrayCollection();
    }

    public function getId()
    {
        return $this->id;
    }

    public function getName()
    {
        return $this->name;
    }

    public function setName($name)
    {
        $this->name = $name;
    }


    public function getBooks()
    {
        return $this->books;
    }

    public function addBook($book)
    {
        $this->books[] = $book;
    }

    public function setBooks($books)
    {
        $this->books = $books;
    }
    public function __toString()
    {
        return $this->name;
    }
}

--------------

namespace Prueba\FrontendBundle\Entity; 

use \Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;

/**
 * @ORM\Entity()
 * @ORM\Table(name="book")
*/
class Book 
{
     /** @ORM\Id @ORM\GeneratedValue @ORM\Column(type="integer") **/
     protected $id;

    /**
     * @ORM\Column(type="string")
     */ 
    protected $title;

    /**
     * @ORM\ManyToMany(targetEntity="Author", inversedBy="books")
     * @ORM\JoinTable(name="author_book")
     */
    protected $authors;

    public function __construct()
    {
        $this->authors = new ArrayCollection();
    }

    public function getId()
    {
        return $this->id;
    }

    public function getTitle()
    {
        return $this->title;
    }

    public function setTitle($title)
    {
        //die("fadsfadsff");
        $this->title = $title;
    }

    public function getAuthors()
    {
        //die();
        return $this->authors;
    }

    public function addAuthor($authors)
    {
        die();//Here is not entering after editing a book!!!!! why????
        $this->authors = $authors;
    }

    public function setAuthors($authors)
    {
        die();//Here is not entering after editing a book!!!!! why????
        $this->authors = $authors;
    }

    public function __toString()
    {
        return $this->title;
    }
}

Answer 1

不确定这是否是问题的原因，但您在两个实体中都指定了inversedBy。

应该是：

class Author
{
    /**
     * @ORM\ManyToMany(targetEntity="Book", inversedBy="authors")
     */
    protected $books;
}

因为作者拥有这些书籍。

和

class Book
{
    /**
     * @ORM\ManyToMany(targetEntity="Author", mappedBy="books")
     */
    protected $authors;
}

因为一本书属于给作者。

Answer 2

级联持久性不是自动的，您没有指定任何cascade rules

/**
 * @ORM\ManyToMany(targetEntity="Book", inversedBy="authors", cascade={"persist"})
 * @ORM\JoinTable(name="author_book")
 */
protected $books;

我自己没有使用过与ManyToMany协会的级联，但它应该可以正常工作

symfony2：如何编写多对多关系的方法？

2 个答案: