index_name

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 920
      def index_name(table_name, options) # :nodoc:
        if Hash === options
          if options[:column]
            "index_#{table_name}_on_#{Array(options[:column]) * '_and_'}"
          elsif options[:name]
            options[:name]
          else
            raise ArgumentError, "You must specify the index name"
          end
        else
          index_name(table_name, index_name_options(options))
        end
      end