商品一覧で複数タグでの検索機能を追加する方法

<?php

namespace Customize\Form\Extension;

use Eccube\Entity\Tag;
use Eccube\Form\Type\SearchProductType;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\FormBuilderInterface;

/**
 * タグの検索フォームを追加
 * @see https://umebius.com/eccube/product_list_tag_search/
 */
class SearchProductTypeTagExtension extends AbstractTypeExtension
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add(
                'tag',
                EntityType::class,
                [
                    'class' => Tag::class,
                    'required' => false,
                    'choice_label' => 'name',
                    'expanded' => true,
                    'multiple' => true,
                    'placeholder' => false,
                    'constraints' => [
                    ],
                ]
            )
        ;
    }

    /**
     * {@inheritdoc}
     */
    public function getExtendedType()
    {
        return SearchProductType::class;
    }

    /**
     * Return the class of the type being extended.
     */
    public static function getExtendedTypes(): iterable
    {
        return [SearchProductType::class];
    }
}

<?php

/*
 * This file is part of EC-CUBE
 *
 * Copyright(c) EC-CUBE CO.,LTD. All Rights Reserved.
 *
 * http://www.ec-cube.co.jp/
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Customize\QueryCustomize;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\QueryBuilder;
use Eccube\Doctrine\Query\QueryCustomizer;
use Eccube\Entity\Tag;
use Eccube\Repository\QueryKey;

/**
 * タグの検索ロジックを追加 * 
 *　　@see https://umebius.com/eccube/product_list_tag_search/
 */
class FrontProductTagCustomizer implements QueryCustomizer
{
    /**
     * @param QueryBuilder $builder
     * @param array $params
     * @param string $queryKey
     */
    final public function customize(QueryBuilder $builder, $params, $queryKey)
    {

        if (isset($params['tag'])) {

            if ($params['tag'] instanceof ArrayCollection) {
                if (count($params['tag'])) {
                    $ids = $params['tag']->map(function ($var) {return $var->getId();})->toArray();
                    $builder->leftJoin('p.ProductTag', 'product_tag');
                    $builder->leftJoin('product_tag.Tag', 'tag');
                    $builder->andWhere($builder->expr()->in('tag.id', $ids));
                }
            } else if ($params['tag'] instanceof Tag){
                $builder->leftJoin('p.ProductTag', 'product_tag');
                $builder->leftJoin('product_tag.Tag', 'tag');
                $builder->andWhere($builder->expr()->eq('tag.id', $params['tag']->getId()));
            }
        }
    }

    /**
     * カスタマイズ対象のキーを返します。
     *
     * @return string
     */
    public function getQueryKey()
    {
        return QueryKey::PRODUCT_SEARCH;
    }
}

ここまでのカスタマイズで、tag[]パラメータをつけると、タグで絞り込んだ商品一覧が表示されるのではないでしょうか。動作確認してみてください。

http://example.com/shop/list?tag[]=(タグID)

しかし現状では並び替えを行うと絞り込みが解除されてしまいます。

3. 並び替えやページネーションに対応(複数検索の場合のみ対応が必要）

複数検索を実装するときに並び替えやページネーションに対応させるポイントです。

テンプレートのProduct/list.twigを修正します。

{% for item in search_form %}
    <input type="hidden" id="{{ item.vars.id }}"
name="{{ item.vars.full_name }}"
{% if item.vars.value is not empty %}value="{{ item.vars.value }}" {% endif %}/>
{% endfor %}

{% for item in search_form %}
    {# タグの複数検索に対応 @see https://umebius.com/eccube/product_list_tag_search/ #}
    {% if item.vars.value is iterable %}
        {% for val in item.vars.value %}
        <input type="hidden" id="{{ item.vars.id }}"
name="{{ item.vars.full_name }}[]" value="{{ val }}"/>
        {% endfor %}
    {% else %}
        <input type="hidden" id="{{ item.vars.id }}"
name="{{ item.vars.full_name }}"
{% if item.vars.value is not empty %}value="{{ item.vars.value }}" {% endif %}/>
    {% endif %}
{% endfor %}

<?php

namespace Customize\Form\Extension;

use Doctrine\ORM\EntityManagerInterface;
use Eccube\Entity\Tag;
use Eccube\Form\Type\SearchProductBlockType;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\FormBuilderInterface;

class SearchProductBlockTypeExtension extends AbstractTypeExtension
{

    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {

        $builder
             ->add(
                'tag',
                EntityType::class,
                [
                    'class' => Tag::class,
                    'required' => false,
                    'choice_label' => 'name',
                    'expanded' => true,
                    'multiple' => true,
                    'placeholder' => false,
                    'constraints' => [
                    ],
                ]
            )

        ;
    }

    /**
     * {@inheritdoc}
     */
    public function getExtendedType()
    {
        return SearchProductBlockType::class;
    }

    /**
     * Return the class of the type being extended.
     */
    public static function getExtendedTypes(): iterable
    {
        return [SearchProductBlockType::class];
    }
}

{{ form_widget(form.tag) }}