add

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 220
      def add(table_name, connection)
        columns.each do |name, type, options|
          connection.add_column(table_name, name, type, **options)
        end

        if index
          connection.add_index(table_name, column_names, **index_options(table_name))
        end

        if foreign_key
          connection.add_foreign_key(table_name, foreign_table_name, **foreign_key_options)
        end
      end