nebulab/spree-subscriptions — pull request #62 by brchristian (2014-08-29 21:31:40+00:00)
Title: add counter_cache for performance improvements on # of shipped issues

This migration adds a counter cache column to track Spree::Issue.shipped_issues.size. Doing this will result in many fewer trips to the db and performance improvements on backend view pages such as Product/issues/index.