20 May '14, 2pm

I thought Rails eager loading used a single SELECT ... LEFT OUTER JOIN, not two SELECT queries

How to find records using a variety of methods and conditions. How to specify the order, retrieved attributes, grouping, and other properties of the found records. How to use eager loading to reduce the number of database queries needed for data retrieval. How to use dynamic finders methods. How to check for the existence of particular records. How to perform various calculations on Active Record models. How to run EXPLAIN on relations.

Full article: http://guides.rubyonrails.org/active_record_querying.html...

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