ruby on rails - Dissecting an ERB to HAML conversion example -

directly rom haml tutorial:

<div class='item' id='item<%= item.id %>'>   <%= item.body %> </div> 

and answer

.item{:id => "item#{item.id}"}= item.body 

i understood reason first .item, ok class declare way. understood hash, ok when have attributes create hash it. part couldn't understand how converted "item#{item.id}" shouldn't sort of "=" sign somewhere? because saying when want calculate ruby code use "=" ?

{:id => "item#{item.id}"} evaluated hash in ruby code haml, don't need =