Rails Code Review PDF

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<br />#:select and :include<br /><br />#If a query contains an :include directive, any :select<br />options will be ignored. For example you might expect this<br />to return an array of ids only. Not so!<br /><br /># This won't work as you expect<br />Farm.find(:all, {<br /> :select => "farms.id, chickens.id",<br /> :include => :chickens<br />})<br /><br />#use :join with :select<br />The way around this is to code the :join explicitly.<br /> Farm.find(:all, {<br /> :select => "farms.id, chickens.id",<br /> :join => "LEFT JOIN ..."<br /> })<br /><br />LEFT OUTER JOIN chickens ON chickens.farm_id =<br />farms.id<br /><br />