#23 Counter Cache Column

If you need to display the record count for a has_many association, you can improve performance by caching that number in a column.

An episode of the RailsCasts (Mobile) podcast, hosted by Ryan Bates, titled "#23 Counter Cache Column" was published on April 25, 2007 and runs 7 minutes.

April 25, 2007 ·7m · RailsCasts (Mobile)

Summary

If you need to display the record count for a has_many association, you can improve performance by caching that number in a column.

Episode Description