actions.rb

def index(options={}, &block)
  respond_with(*(with_chain(collection) << options), &block)
end

base_helpers.rb

def with_chain(object)
  association_chain + [ object ]
end

def association_chain
  return @association_chain if @association_chain

  symbol_chain = if resources_configuration[:self][:singleton]
    symbols_for_association_chain.reverse
  else
    symbols_for_association_chain
  end

  @association_chain =
    symbol_chain.inject([begin_of_association_chain]) do |chain, symbol|
      chain << evaluate_parent(symbol, resources_configuration[symbol], chain.last)
    end.compact.freeze
end