class Travis::Client::Session

def find_one_or_many(entity, args = nil)
  raise Travis::Client::Error, "cannot fetch #{entity}" unless entity.respond_to?(:many) and entity.many
  cached(entity, :one_or_many, args) do
    path       = "/#{entity.many}"
    path, args = "#{path}/#{args}", {} unless args.is_a? Hash
    result     = get(path, args)
    one        = result[entity.one]
    if result.include? entity.many
      Array(one) + Array(result[entity.many])
    else
      one
    end
  end
end