# File lib/foreigner/connection_adapters/postgresql_adapter.rb, line 6
      def remove_foreign_key(table, options)
        if Hash === options
          foreign_key_name = foreign_key_name(table, options[:column], options)
        else
          foreign_key_name = foreign_key_name(table, "#{options.to_s.singularize}_id")
        end

        execute "ALTER TABLE #{quote_table_name(table)} DROP CONSTRAINT #{quote_column_name(foreign_key_name)}"
      end