new

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 120
      def initialize(
        name,
        polymorphic: false,
        index: true,
        foreign_key: false,
        type: :bigint,
        **options
      )
        @name = name
        @polymorphic = polymorphic
        @index = index
        @foreign_key = foreign_key
        @type = type
        @options = options

        if polymorphic && foreign_key
          raise ArgumentError, "Cannot add a foreign key to a polymorphic relation"
        end
      end