Heya, 

Setting condition classes is a huge pain in rails at the moment, or maybe i 
am missing it but i can't see to find it. borrowed from react components 
kind of style.

I want something like this (the class selected is only added if the value 
is true)

link_to("Homepage", root_path, class: {selected: selected?})

-> a href class="selected" and other

You can do the same thing to add multiple classes too

link_to("Hello", root_path, class: {class: {btn:true, selected: selected?}}

I think this would be awesome, anything reasons why we shouldn't implement 
this?

Cheers,

- Emile

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