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: property.rb
    path of file: ./repos/activegraph/lib/active_graph/node
    
    the code of the file until where you have to start completion: module ActiveGraph::Node
  module Property
    extend ActiveSupport::Concern
    include ActiveGraph::Shared::Property

    def initialize(attributes = nil)
      super(attributes)
      @attributes ||= ActiveGraph::AttributeSet.new(self.class.attributes_nil_hash, self.class.attributes.keys)
    
    
      def association_method_keys
        @association_method_keys ||=
          associations_keys.map(&:to_sym) +
          associations.values.map do |association|
            if association.type == :has_one
              "#{association.name}_id"
            elsif association.type == :has_many
              "#{association.name.to_s.singularize}_ids"
            end.to_sym
          end
      end