class AbstractAdapter

  # single-instance methods
  def create(repo, instance)

  def read(repo, instance)

  def update(repo, instance)

  def delete(repo, instance)

  # non-instance methods (PKEY or search params)
  def read_one(repo, klass, *keys)

  def read_set(repo, klass, query)

  def delete_one(repo, klass, *keys)

  def delete_set(repo, klass, query)

  # other methods (helpers

  def first(repo, klass, query)
    read_set(repo, klass, query.merge(:limit => 1)
  end

end