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In Rails 6.1 it throws error:
Query method called with non-attribute argument(s): "COALESCE(scheduled_at, created_at) DESC"
It was printing a warning about it in Rails 6.0.
Sorry for not including spec - I had issues with setting up system specs.
BTW, Rails 6.1 is around the corner https://weblog.rubyonrails.org/2020/12/1/Rails-6-1-rc2-release/ so I guess we could extend appraisal to 6.1