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Friday, October 22, 2010

Rail's ActiveRecord: include vs join

Confused when to use the :include vs. :join option? Remember these points:

  • join does not load the association into association
  • include does, it loads each association into memory
  • include is not compatible with select option
  • use include when the association is referenced
  • example use with join, doing a dynamic count on an association
  • or when the association is not referenced

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