I thought this would be easier unless I'm missing something but I can't figure out how to output a piece of my data as a class.
<div class="partner-type" rv-class="partner.partner-type"></div>
I ended up using something like
rv-class-ineededthisclass="partner.partner_type | isNotEqual 'premier'"
Btw, this library is great for rivetsjs: https://github.com/matthieuriolo/rivetsjs-stdlib