Update

app/controllers/node_controller.rb

@@ -1,10 +1,9 @@
 class NodeController < ApplicationController
       before_action :require_login
-      
+
   def index
     @hosts = Array.new
     @nodes = Node.all.order("id asc") 
-    
     if get_hosts.blank?
       flash[:danger] = "Check Server"
     else
@@ -15,9 +14,9 @@ class NodeController < ApplicationController
   def get_hosts
     return ['2', 'aaa', 'bbb', 'ccc']
   end
-  
+
   def node_add
-    new_node = Node.new	
+    new_node = Node.new
     new_node.host_name = params[:host_name]
     new_node.host_ip = params[:host_ip]
     new_node.user_name = params[:user_name]
@@ -25,7 +24,7 @@ class NodeController < ApplicationController
     new_node.save
     redirect_to '/node/index'
   end
-  
+
   def node_delete
     one_node = Node.find(params[:node_id])
     one_node.destroy