You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rel_type_converters.rb
    path of file: ./repos/activegraph/lib/active_graph/shared
    
    the code of the file until where you have to start completion: module ActiveGraph::Shared
  # This module controls changes to relationship type based on ActiveGraph::Config.transform_rel_type.
  # It's used whenever a rel type is automatically determined based
    
      def decorated_rel_type(type)
        type = type.to_s
        decorated_type =  case rel_transformer
                          when :upcase
                            type.underscore.upcase
                          when :downcase
                            type.underscore.downcase
                          when :legacy
                            "##{type.underscore.downcase}"
                          when :none
                            type
                          else
                            type.underscore.upcase
                          end