type_map (DataMapper::Migrations::PostgresAdapter::ClassMethods)

    # File lib/dm-core/migrations.rb, line 716
            def type_map
              precision = Property::DEFAULT_PRECISION
              scale     = Property::DEFAULT_SCALE_BIGDECIMAL

              @type_map ||= super.merge(
                BigDecimal => { :primitive => 'NUMERIC', :precision => precision, :scale => scale },
                Float      => { :primitive => 'DOUBLE PRECISION'                                  }
              ).freeze
            end