gistfile1.rb

create_table(:pairs) do
  primary_key :id

  foreign_key :left_leaf_id, :leafs, :key => :id
  foreign_key :right_leaf_id, :leafs, :key => :id
  String :description

  FalseClass :enabled

  Time :created_at, :null => false, :index => true
  Time :modified_at, :null => false, :index => true
  # constraint(:pair_ids_unique, Sequel.function{pairs__left_leaf_id != pairs__right_leaf_id})
  # constraint(:pair_ids_unique, Sequel.function(pairs__left_leaf_id != pairs__right_leaf_id))
  # constraint(:pair_ids_unique, Sequel.function(left_leaf_id != right_leaf_id))
end