gistfile1.txt

INFO = <<HERE
TABLES:
gds
  - key gds
gse
  - key gse

gds_gse
  - key gds
  - int gse

a GDS has 1 GSE, and a GSE belongs to one GDS (through GDS_GSE, so apparently I ought to use a has 1 relationship). How can I write this? I've been entirely unable to figue it out.
HERE

class GDS
  include DataMapper::Resource
  def self.default_repository_name; :expr_geo; end
  storage_names[:expr_geo] = "gds"
  property :gds, Integer, :key => true
  has 1, :gse, "GSE", :child_key => [:gse], :parent_key => [:gds], :through => GDSGSE 

class GDSGSE
  include DataMapper::Resource
  def self.default_repository_name; :expr_geo; end
  storage_names[:expr_geo] = "gds_gse"
  belongs_to :gds, "GDS", :child_key => [:gds], :parent_key => [:gds], :key => true
  has 1, :gse, "GSE", :child_key => [:gse], :parent_key => [:gse]
end

 class GSE# < GEO
  include DataMapper::Resource
  def self.default_repository_name; :expr_geo; end
  storage_names[:expr_geo] = "gse"
  has 1, :gds, "GDS", :through => :gds_gse, :child_key => [:gse], :parent_key => [:gds], :key => true
end