## 2 queries, union in ruby :(

# this works, but it requires making the query and can't build a relation.
class Baz < ActiveRecord::Base
  def foos
    baras_foos = Foo.joins(:baras).where(:baras => {:baz_id => id})
    barbs_foos = Foo.joins(:barbs).where(:barbs => {:baz_id => id})

    bar_a_foos | bar_bs_foos
  end
end

## attempt at the relation approach :|

# this sort of works, but there are many duplicate records.
class Baz < ActiveRecord::Base
  def foos
    Foo.joins(:baras, :barbs).where(Bara.arel_table[:baz_id].eq(id).or(Barb.arel_table[:baz_id].eq(id)))
  end
end

## the proper relation approach :)

?