first commit

src/Post/Infrastructure/PdoTaxonUsageChecker.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Post\Infrastructure;
+
+use Netig\Netslim\Taxonomy\Contracts\TaxonUsageCheckerInterface;
+use PDO;
+
+/**
+ * Vérifie si un terme de taxonomie est encore référencé par au moins un post.
+ */
+final readonly class PdoTaxonUsageChecker implements TaxonUsageCheckerInterface
+{
+    public function __construct(private PDO $db) {}
+
+    public function isTaxonInUse(int $taxonId): bool
+    {
+        $stmt = $this->db->prepare('SELECT COUNT(*) FROM posts WHERE category_id = :category_id');
+        $stmt->execute([':category_id' => $taxonId]);
+
+        return (int) $stmt->fetchColumn() > 0;
+    }
+}