ruby on rails - ActiveRecord Relation size strange behavior -
i have encountered strange behavior of activerecord relation recently. suppose, have stat model following properies: clicks views created_at and others further suppose have following scope: scope :aggregated, select('sum(clicks) clicks, sum(views) views).group('date(created_at)') as result expect array of stat object info aggregated day, , is. consider this: # in 1 place = stat.aggregated #in other place if a.size > 0 'do stuff' else 'do other stuff' end and it works fine if a relation is loaded , when a not loaded fails method undefined error. turns out when relation not loaded size calls count on relation, changes query, returns hash, , brakes code. is implied behavior? for me kind of counter-intuitive change method semantics depending on whether relation loaded or not. that's how activerecord relation works. can convert array , size on it. a = stat.aggregated.to_a #in other place if a.size >