Ruby on Rails

Hello,

I'd like to have the main menu of my web application dynamically
generated from categories stored in a database.

I created a partial for this menu:
(views/category/_list.html.erb)

<ul>
<% @categories.each do |category| %>
<li><%= category.name %></li>
<% end %>
</ul>

And I call this partial in the main layout:
(layouts/application.html.erb):

<%= render 'category/list' %>

Unfortunately, the @categories variable is Nil because the category/list
controller is not called with this method.

How can I simply achieve this ? Thank you,

Fabrice

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