Question

I am new to RoR.

I just download some sample codes and deploy the app.
After that, I get error message as follows:

undefined method `url' for nil:NilClass
Extracted source (around line #5):

2: 
3: <p>
4:   <b>Url:</b>
5:   <%= @page.url %>
6: </p>
7: 

And the corresponding codes in pages_controller.rb is

def index 
  @pages = Page.all
  respond_with(@pages)
end

Is there any suggestion for handling this error?
Thanks

Answer 1

Elaborating on @Lakitu’s answer a bit, you should have something like this in your index view:

<% for page in @pages do %>
  <p><b>Url:</b> <%= page.url %></p>
<% end %>

Don’t know why scaffolding produced this issue, but the root cause is very well explained by @Lakitu (+1 for that).