Рельс Image Tag
<%= image_tag 'icon.png', alt: 'icon' %>
# => <img src='app/assets/images/icon.png' alt='icon' />
Lioruby
<%= image_tag 'icon.png', alt: 'icon' %>
# => <img src='app/assets/images/icon.png' alt='icon' /><%= image_tag 'filename', title: "title", class: "class", data: { description: '..', title: '..' } %>
<%= link_to image_tag('btn.png'), '/books/index' %>
--> <a href="/books/index"><img alt="Btn" src="/assets/btn.png" /></a>