How to avoid hanging yourself with Rails
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The document provides tips for improving the performance of Rails applications that have common ActiveRecord performance problems related to has_many relationships. It discusses ways to avoid unnecessary SQL queries through eager loading with :include and limiting columns with :select. Writing custom SQL queries is presented as the fastest approach but also notes the tradeoffs around maintaining custom SQL. The document emphasizes testing applications with large realistic data sets and using indexes, counters, and frameworks like Merb to further boost performance.
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