80 lines
2.4 KiB
PHP
80 lines
2.4 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace App\Form\DataTransformer;
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use App\Entity\Tag;
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use App\Repository\TagRepository;
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use Symfony\Component\Form\DataTransformerInterface;
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use function Symfony\Component\String\u;
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/**
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* This data transformer is used to translate the array of tags into a comma separated format
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* that can be displayed and managed by Bootstrap-tagsinput js plugin (and back on submit).
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*
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* See https://symfony.com/doc/current/form/data_transformers.html
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*
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* @author Yonel Ceruto <yonelceruto@gmail.com>
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* @author Jonathan Boyer <contact@grafikart.fr>
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*/
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class TagArrayToStringTransformer implements DataTransformerInterface
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{
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private $tags;
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public function __construct(TagRepository $tags)
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{
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$this->tags = $tags;
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}
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/**
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* {@inheritdoc}
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*/
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public function transform($tags): string
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{
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// The value received is an array of Tag objects generated with
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// Symfony\Bridge\Doctrine\Form\DataTransformer\CollectionToArrayTransformer::transform()
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// The value returned is a string that concatenates the string representation of those objects
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/* @var Tag[] $tags */
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return implode(',', $tags);
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}
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/**
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* {@inheritdoc}
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*/
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public function reverseTransform($string): array
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{
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if (null === $string || u($string)->isEmpty()) {
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return [];
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}
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$names = array_filter(array_unique(array_map('trim', u($string)->split(','))));
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// Get the current tags and find the new ones that should be created.
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$tags = $this->tags->findBy([
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'name' => $names,
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]);
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$newNames = array_diff($names, $tags);
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foreach ($newNames as $name) {
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$tag = new Tag();
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$tag->setName($name);
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$tags[] = $tag;
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// There's no need to persist these new tags because Doctrine does that automatically
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// thanks to the cascade={"persist"} option in the App\Entity\Post::$tags property.
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}
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// Return an array of tags to transform them back into a Doctrine Collection.
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// See Symfony\Bridge\Doctrine\Form\DataTransformer\CollectionToArrayTransformer::reverseTransform()
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return $tags;
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}
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}
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