Rails - Sep 2008 - Join different querys in the same object

Hi, I''m new in Ruby on Rails and I don''t know how can I achive
something like this:

@switchs = Switch.find(:all)
    for switch in @switchs
      if current_user.shifts.count(:all,:conditions=>["date = ? and
shift = ?",switch.destiny_date, switch.destiny_turn]) !=0
        @valid = switch
        @valid.merge(cambio)
      end
    end
    return @valid

Let me explain. I just want to put in the same @valid object, switchs
that satisfy the "if" condition. So, I have to loop for every switch
and just select those ones that satisfy the condition. Is there any
way to achieve this???

Thanks in advance.
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