上下文:

让有两个实体(为 Doctrine 正确映射)。

1. Post 具有属性 {$id(整数、autoinc)、$name(字符串)、$tags(标签的集合)}
2. Tag 属性 {$id (integer, autoinc), $name (string), $posts(Post 的集合)}

这两者之间的关系是多对多。

问题:

当创建一个新的 Post 时，我想立即给它添加标签。

如果我想添加已经存在的标签，我会创建entity field type ，没问题。

但是如果我也想添加全新的标签，我该怎么办？ (检查一些已经存在的标签，为新标签填写名称，也许添加一些其他新标签，然后在提交后将所有内容正确分配给 Post 实体)

    Create new Post:
     Name: [__________]

    Add tags
    |
    |[x] alpha
    |[ ] beta
    |[x] gamma
    |
    |My tag doesnt exist, create new:
    |
    |Name: [__________]
    |
    |+Add another new tag

有什么办法吗？我知道 Symfony 2 的基础知识，但不知道如何处理这个问题。我也很惊讶我没有在任何地方找到答案，这对我来说似乎是一个常见问题。我错过了什么？

最佳答案

我的标签实体有一个唯一的标签名称字段。对于添加标签，我使用了新的表单类型和转换器。

表单类型:

namespace Sg\RecipeBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Bridge\Doctrine\RegistryInterface;
use Symfony\Component\Security\Core\SecurityContextInterface;
use Sg\RecipeBundle\Form\DataTransformer\TagsDataTransformer;

class TagType extends AbstractType
{
    /**
     * @var RegistryInterface
     */
    private $registry;

    /**
     * @var SecurityContextInterface
     */
    private $securityContext;


    /**
     * Ctor.
     *
     * @param RegistryInterface        $registry        A RegistryInterface instance
     * @param SecurityContextInterface $securityContext A SecurityContextInterface instance
     */
    public function __construct(RegistryInterface $registry, SecurityContextInterface $securityContext)
    {
        $this->registry = $registry;
        $this->securityContext = $securityContext;
    }

    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addViewTransformer(
            new TagsDataTransformer(
                $this->registry,
                $this->securityContext
            ),
            true
        );
    }

    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return 'text';
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'tag';
    }
}

变形金刚:

<?php

/*
 * Stepan Tanasiychuk is the author of the original implementation
 * see: https://github.com/stfalcon/BlogBundle/blob/master/Bridge/Doctrine/Form/DataTransformer/EntitiesToStringTransformer.php
 */

namespace Sg\RecipeBundle\Form\DataTransformer;

use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Security\Core\SecurityContextInterface;
use Symfony\Component\Security\Core\Exception\AccessDeniedException;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Bridge\Doctrine\RegistryInterface;
use Doctrine\ORM\EntityManager;
use Doctrine\Common\Collections\Collection;
use Doctrine\Common\Collections\ArrayCollection;
use Sg\RecipeBundle\Entity\Tag;

/**
 * Tags DataTransformer.
 */
class TagsDataTransformer implements DataTransformerInterface
{
    /**
     * @var EntityManager
     */
    private $em;

    /**
     * @var SecurityContextInterface
     */
    private $securityContext;


    /**
     * Ctor.
     *
     * @param RegistryInterface        $registry        A RegistryInterface instance
     * @param SecurityContextInterface $securityContext A SecurityContextInterface instance
     */
    public function __construct(RegistryInterface $registry, SecurityContextInterface $securityContext)
    {
        $this->em = $registry->getEntityManager();
        $this->securityContext = $securityContext;
    }

    /**
     * Convert string of tags to array.
     *
     * @param string $string
     *
     * @return array
     */
    private function stringToArray($string)
    {
        $tags = explode(',', $string);

        // strip whitespaces from beginning and end of a tag text
        foreach ($tags as &$text) {
            $text = trim($text);
        }

        // removes duplicates
        return array_unique($tags);
    }

    /**
     * Transforms tags entities into string (separated by comma).
     *
     * @param Collection | null $tagCollection A collection of entities or NULL
     *
     * @return string | null An string of tags or NULL
     * @throws UnexpectedTypeException
     */
    public function transform($tagCollection)
    {
        if (null === $tagCollection) {
            return null;
        }

        if (!($tagCollection instanceof Collection)) {
            throw new UnexpectedTypeException($tagCollection, 'Doctrine\Common\Collections\Collection');
        }

        $tags = array();

        /**
         * @var \Sg\RecipeBundle\Entity\Tag $tag
         */
        foreach ($tagCollection as $tag) {
            array_push($tags, $tag->getName());
        }

        return implode(', ', $tags);
    }

    /**
     * Transforms string into tags entities.
     *
     * @param string | null $data Input string data
     *
     * @return Collection | null
     * @throws UnexpectedTypeException
     * @throws AccessDeniedException
     */
    public function reverseTransform($data)
    {
        if (!$this->securityContext->isGranted('ROLE_AUTHOR')) {
            throw new AccessDeniedException('Für das Speichern von Tags ist die Autorenrolle notwendig.');
        }

        $tagCollection = new ArrayCollection();

        if ('' === $data || null === $data) {
            return $tagCollection;
        }

        if (!is_string($data)) {
            throw new UnexpectedTypeException($data, 'string');
        }

        foreach ($this->stringToArray($data) as $name) {

            $tag = $this->em->getRepository('SgRecipeBundle:Tag')
                ->findOneBy(array('name' => $name));

            if (null === $tag) {
                $tag = new Tag();
                $tag->setName($name);

                $this->em->persist($tag);
            }

            $tagCollection->add($tag);

        }

        return $tagCollection;
    }
}

config.yml

recipe.tags.type:
    class: Sg\RecipeBundle\Form\Type\TagType
    arguments: [@doctrine, @security.context]
    tags:
        - { name: form.type, alias: tag }

使用新类型:

        ->add('tags', 'tag', array(
            'label' => 'Tags',
            'required' => false
            ))

类似“symfony”和“smfony”的相似之处可以通过自动完成功能来避免:

标签 Controller :

<?php

namespace Sg\RecipeBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Response;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;

/**
 * Tag controller.
 *
 * @Route("/tag")
 */
class TagController extends Controller
{
    /**
     * Get all Tag entities.
     *
     * @Route("/tags", name="tag_tags")
     * @Method("GET")
     *
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function getTagsAction()
    {
        $request = $this->getRequest();
        $isAjax = $request->isXmlHttpRequest();

        if ($isAjax) {
            $em = $this->getDoctrine()->getManager();

            $search = $request->query->get('term');

            /**
             * @var \Sg\RecipeBundle\Entity\Repositories\TagRepository $repository
             */
            $repository = $em->getRepository('SgRecipeBundle:Tag');

            $qb = $repository->createQueryBuilder('t');
            $qb->select('t.name');
            $qb->add('where', $qb->expr()->like('t.name', ':search'));
            $qb->setMaxResults(5);
            $qb->orderBy('t.name', 'ASC');
            $qb->setParameter('search', '%' . $search . '%');

            $results = $qb->getQuery()->getScalarResult();

            $json = array();
            foreach ($results as $member) {
                $json[] = $member['name'];
            };

            return new Response(json_encode($json));
        }

        return new Response('This is not ajax.', 400);
    }
}

form.html.twig:

<script type="text/javascript">

    $(document).ready(function() {

        function split(val) {
            return val.split( /,\s*/ );
        }

        function extractLast(term) {
            return split(term).pop();
        }

        $("#sg_recipebundle_recipetype_tags").autocomplete({
            source: function( request, response ) {
                $.getJSON( "{{ path('tag_tags') }}", {
                    term: extractLast( request.term )
                }, response );
            },
            search: function() {
                // custom minLength
                var term = extractLast( this.value );
                if ( term.length < 2 ) {
                    return false;
                }
            },
            focus: function() {
                // prevent value inserted on focus
                return false;
            },
            select: function( event, ui ) {
                var terms = split( this.value );
                // remove the current input
                terms.pop();
                // add the selected item
                terms.push( ui.item.value );
                // add placeholder to get the comma-and-space at the end
                terms.push( "" );
                this.value = terms.join( ", " );
                return false;
            }
        });

    });

</script>

关于php - 带有选择和/或添加新的 Symfony 2 实体字段类型，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15682494/