update

app/common/model/MaintenanceCategory.php

@@ -36,6 +36,14 @@ class MaintenanceCategory extends BaseModel
         return static::get($categoryId);
     }
 
+    public function catImg(): HasOne
+    {
+        $module = self::getCalledModule();
+        return $this->hasOne("app\\{$module}\\model\\UploadFile", 'file_id', 'img_id')
+            ->bind(['img_url' => 'preview_url']);
+    }
+
+
 
     /**
      * 获取列表
@@ -47,7 +55,7 @@ class MaintenanceCategory extends BaseModel
      */
     public function getList(array $where = []): \think\Collection
     {
-        return $this->where($where)
+        return $this->where($where)->with(['catImg'])
             ->order(['sort', $this->getPk()])
             ->select();
     }