DataMapper ORM v1.8.0

[eluser]WanWizard[/eluser]

Code:

include_related('b',array('id', 'this', 'that'),TRUE)

should work without problems.

Or do you mean the join criteria (which has nothing to do with including columns)?

For that, the answer is "You can't". Datamapper is an ORM, and maintains it's relations based on the PK-FK connection. Which is what is used to join two related tables.

This specific example could be solved with a WHERE:

Code:

where_related('b', 'id', 23)

resulting in

Code:

select * from a left outer join b ON a.id = b.a_id WHERE b.id = 23;