@classmethod
  @gen.coroutine
  def UpdateExisting(cls, client, **ph_dict):
    assert 'timestamp' not in ph_dict and 'episode_id' not in ph_dict and 'user_id' not in ph_dict, ph_dict
    photo = Photo.CreateFromKeywords(**ph_dict)
    yield photo.Update(client)
Check for the existence of a rule in the table and chain
dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/photo.py/Photo.UpdateExisting--crossover with--dataset/ETHPy150Open saltstack/salt/salt/modules/iptables.py/check