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Tag Archives: activerecord

Demystifying eager loading with ActiveRecord

Eager loading in ActiveRecord is a great feature. It prevents what’s called the “n+1″ problem. From the docs (emphasis mine):
Eager loading is a way to find objects of a certain class and a number of named associations. This is one of the easiest ways of to prevent the dreaded 1+N problem in which fetching 100 [...]

Posted 26 January 2010 † admin § Uncategorized ‡ Comments (5) ° Also tagged: , , ,

From ActiveRecord to Raw SQL

ActiveRecord is awesome. Its dynamic finder methods, scopes, and effortless joins make working with a database a snap. But there are always those times when writing raw sql makes more sense. In my case, I was joining across several tables, and then sorting by a value from the joined table. The problem was that my [...]

Posted 19 November 2009 † admin § Uncategorized ‡ Comments (2) ° Also tagged: , , , , ,