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: custom_field.rb
    path of file: ./repos/openproject/app/models/custom_actions/actions
    
    the code of the file until where you have to start completion: #-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2024 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
#
    
  def self.strategy(custom_field)
    case custom_field.field_format
    when 'string'
      CustomActions::Actions::Strategies::String
    when 'text'
      CustomActions::Actions::Strategies::Text
    when 'int'
      CustomActions::Actions::Strategies::Integer
    when 'float'
      CustomActions::Actions::Strategies::Float
    when 'date'
      CustomActions::Actions::Strategies::Date
    when 'bool'
      CustomActions::Actions::Strategies::Boolean
    when 'user'
      CustomActions::Actions::Strategies::UserCustomField
    when 'list', 'version'
      CustomActions::Actions::Strategies::AssociatedCustomField
    end