使用Symfony 3.4按日期、类别和标签进行搜索

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\ArticleRepository")
 */
class Article
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="date")
     */
    private $date;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $category;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $tag;

    // 省略getter和setter方法
}

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use App\Entity\Article;

class SearchController extends AbstractController
{
    /**
     * @Route("/search", name="search")
     */
    public function search(Request $request)
    {
        $date = $request->query->get('date');
        $category = $request->query->get('category');
        $tag = $request->query->get('tag');

        $articles = $this->getDoctrine()
            ->getRepository(Article::class)
            ->createQueryBuilder('a')
            ->where('a.date = :date')
            ->andWhere('a.category = :category')
            ->andWhere('a.tag = :tag')
            ->setParameter('date', $date)
            ->setParameter('category', $category)
            ->setParameter('tag', $tag)
            ->getQuery()
            ->getResult();

        return $this->render('search/index.html.twig', [
            'articles' => $articles,
        ]);
    }
}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>Search Results</h1>

    {% if articles is empty %}
        <p>No articles found.</p>
    {% else %}
        <ul>
            {% for article in articles %}
                <li>{{ article.title }}</li>
            {% endfor %}
        </ul>
    {% endif %}
{% endblock %}