column_spec_for_primary_key

# File activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb, line 13
      def column_spec_for_primary_key(column)
        return {} if default_primary_key?(column)
        spec = { id: schema_type(column).inspect }
        spec.merge!(prepare_column_options(column).except!(:null))
        spec[:default] ||= "nil" if explicit_primary_key_default?(column)
        spec
      end