def get_versions(self, server):
    if server not in self._server_name_to_versions:
      raise ServerDoesNotExistError()
    return self._server_name_to_versions[server]
Set the constraints for an eager load of the relation.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/request_info.py/_LocalFakeDispatcher.get_versions--crossover with--dataset/ETHPy150Open sdispater/orator/orator/orm/relations/belongs_to_many.py/BelongsToMany.add_eager_constraints