Dynamically adding a class to a div in a .erb with Ruby on Rails

Question

I have this div

<div class='notice'>

And I want the result to be

<div class="notice error">

And Is there a way to add a class in my erb? I tried

<div class="notice #{new_class}">

But that doesn't escape into ruby code when it renders...

and ideas?

Answer 1

It's with <%= %>

<div class="notice <%= new_class %>">