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The Ruby and Rails community linklog

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Finding the most recent by group in Rails

by Stephen Karger —

https://www.salsify.com/blog/engineering/most-recent-by-group-in-rails

A certain kind of question comes up sometimes when building an application with a relational database: What is the most recent item for each category?

This blog post walks through writing a SQL query to answer that question, and integrating the query into ActiveRecord models so that associations and eager loading work smoothly.

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