Remove unwanted fields from admin view, along with edit and new action

app/admin/device.rb

@@ -1,5 +1,7 @@
 ActiveAdmin.register Device do
 
+  actions :all, except: [:edit,:new]
+
 # See permitted parameters documentation:
 # https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
 #
@@ -12,6 +14,13 @@ ActiveAdmin.register Device do
 #   permitted << :other if resource.something?
 #   permitted
 # end
-
+  index do
+    selectable_column
+    id_column
+    column "Model Name",:model
+    column :created_at
+    column :updated_at
+    actions
+  end
 
 end