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* Override AR::Relation methods in NullRelation.Juanjo Bazán2012-04-111-0/+53
| | | So a NullRelation (Relation#none) is chainable with database methods.
* Added `none` query method to return zero records.Juanjo Bazán2012-01-311-0/+10
And added NullRelation class implementing the null object pattern for the `Relation` class.