66 

    67   @staticmethod

    68   def doesUserExist(user=None):

    69     """Returns if user already exists in the Datastore.

    70     

    71     Args:

    72       user: a Google Account object,

    73     """

    74     #: let's do a gql query and check if user exists in datastore

    75     data = self.getUser(user)

    76     if data:

    77       return True

    78     else:

    79       return False

    80 

    81   @staticmethod

    82   def getUser(user=None):

    83     """Returns User entity from datastore, or None if not found.  

    84     

    85     Args:

    86       user: a Google Account object,

    87     """

    88     return User.gql('WHERE id = :1', user).get()

    89 

    90   @staticmethod

    91   def getUserForLinkname(link_name=None):

    92     """Returns User entity for linkname or None if not found.

    93     

    94     Args:

    95       link_name: linkname used in URLs to identify user,

    96     """

    97     return User.gql('WHERE link_name = :1', link_name).get()

    98