type_to_sql (ActiveRecord::ConnectionAdapters::PostgreSQLAdapter)

    # File lib/active_record/connection_adapters/postgresql_adapter.rb, line 905
          def type_to_sql(type, limit = nil, precision = nil, scale = nil)
            return super unless type.to_s == 'integer'

            case limit
              when 1..2;      'smallint'
              when 3..4, nil; 'integer'
              when 5..8;      'bigint'
              else raise(ActiveRecordError, "No integer type has byte size #{limit}. Use a numeric with precision 0 instead.")
            end
          end