[Rails] How to implement sory-by links?

Hello people.

I have an app which lists Offers from different Vendors.

I want to implement "sort by" links and I'll do this using scopes in my Offer model. But how should I implement the functionality in the controllers/router? Should I use a member route along with a new controller action (eg. "expiring", or "most_expensive") or just use param queries? 

My app: https://github.com/Agis-/ehm

Thanks in advance!

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