update

app/Http/Controllers/Admin/BookController.php

@@ -149,7 +149,7 @@ class BookController extends BaseController
         // 维护中
         $chart['maintaining'] = Book::where('status', 2)->count();
         // 分类数据
-        dd(Book::pluck('category'));
+        dd(Book::get()->implode('category', ','));
         $category = Book::pluck('category')->collapse()->unique()->values();
         return $this->success(compact('chart', 'category', 'list'));
     }