parameters: (cls, auth_id)
return_statement: return cls.query(cls.auth_ids == auth_id).get()
docstring: Returns a user object based on a auth_id.
  
          :param auth_id:
              String representing a unique id for the user. Examples:
  
              - own:username
              - google:username
          :returns:
              A user object.
docstring_summary: Returns a user object based on a auth_id.
docstring_tokens: Returns a user object based on a auth_id .
function: def get_by_auth_id(cls, auth_id):
          """Returns a user object based on a auth_id.
  
          :param auth_id:
              String representing a unique id for the user. Examples:
  
              - own:username
              - google:username
          :returns:
              A user object.
          """
          return cls.query(cls.auth_ids == auth_id).get()
function_tokens: def get_by_auth_id ( cls , auth_id ) : return cls . query ( cls . auth_ids == auth_id ) . get ( )