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