Harden select_for_count #676
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In a project using Kaminari, I ran into an instance where the
select_valuesfor the query included anArel::Attributes::Attributefor*instead of some kind ofArel::Node, which resulted in aNoMethodErrorbeing raised.I temporarily circumvented this by specifying the
idattribute as the column to count, but I figured it would be good to harden the implementation to help others in the future.