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: association.rb
    path of file: ./repos/activegraph/lib/active_graph/node/has_n
    
    the code of the file until where you have to start completion: module ActiveGraph
  module Node
    module HasN
      class Association
        include ActiveGraph::Shared::RelTypeConverters
        include ActiveGraph::Node::Dependent::AssociationMethods
        include ActiveGraph::Node::Has
    
        def validate_association_options!(_association_name, options)
          ClassArguments.validate_argument!(options[:model_class], 'model_class')
          ClassArguments.validate_argument!(options[:rel_class], 'rel_class')

          message = case
                    when (message = type_keys_error_message(options.keys))
                      message
                    when !(unknown_keys = options.keys - VALID_ASSOCIATION_OPTION_KEYS).empty?
                      "Unknown option(s) specified: #{unknown_keys.join(', ')}"
                    end