Question

I’m following mhartl’s tutorial at ruby.railstutorial.org and I’m having an issue with the index function of the users_controller. In the console, I can enter this code:

@users = User.all

and it properly accesses the SQL database and displays the list of all users. However, when I try to load the page I get various errors depending on how I use the list in the index file, but all involving the list being nil. For example, if my index page contains this:

<% @users.each do |user| %>
    <li>
        <%= link_to user.name, user %>
    </li>
<% end %>

The server spits out:

undefined method `each' for nil:NilClass

Something like render @users gives me the error of 'nil' is not an ActiveModel-compatible object that returns a valid partial path.

I am really confused why I would get this error if it works in the console. Let me know if you need some other code from me.

Thanks for your help!

Answer 1

All this error messages indicate that @user is nil in your view.
Assuming the view is views/users/index.html.erb, have you initialized @users in your users_controller index action like this?

def index
  @users = User.all
end