重构初始化

app/repository/file/FileRecordRepository.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace app\repository\file;
+
+use app\common\base\BaseRepository;
+use app\model\file\FileRecord;
+
+/**
+ * 文件仓储。
+ */
+class FileRecordRepository extends BaseRepository
+{
+    public function __construct()
+    {
+        parent::__construct(new FileRecord());
+    }
+
+    public function findById(int $id, array $columns = ['*']): ?FileRecord
+    {
+        $model = $this->find($id, $columns);
+
+        return $model instanceof FileRecord ? $model : null;
+    }
+}