fix some problems

app/Services/Media/Media.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Services\Media;
+
+use Spatie\MediaLibrary\Models\Media as BaseMedia;
+
+class Media extends BaseMedia
+{
+    public function getTable()
+    {
+        return config('common.db_name') . '.media';
+    }
+
+    public function getThumbnailAddressAttribute()
+    {
+        return $this->getUrl('thumbnail');
+    }
+
+    public function assign($model, $collectionName)
+    {
+        $this->collection_name = $collectionName;
+        $model->media()->save($this);
+    }
+}