调整上传图片

app/Admin/Controllers/Advert/IndexController.php

@@ -43,6 +43,7 @@ class IndexController extends AdminController
 
     /**
      * Make a form builder.
+     *
      * @return Form
      */
     protected function form()
@@ -59,14 +60,8 @@ class IndexController extends AdminController
                 'min'      => '必须选择所属分类',
             ]);
         $form->image('cover', '封面图片')
-            ->rules(function ($form) {
-                if ($form->model()->cover != []) {
-                    return 'nullable|image';
-                } else {
-                    return 'required';
-                }
-            })
-            ->move('images/' . date('Y/m/d'))
+            ->rules('image|mimes:jpeg,jpg,png')
+            ->move('images/'.date('Y/m/d'))
             ->removable()
             ->uniqueName();
         $form->text('url', '链接地址');