Question

鉴于用户_id,能否找到用户电子邮件?

Answer 1

似乎不可能从用户id处获得电子邮件。如果您想从用户到电子邮件,那么,在用户挂牌时,你必须储存,然后当用户不挂在册时,就进行转换。例如:

class Email(db.model):
     keyed by user_id   
  email=db.EmailProperty()

def save_user():
  u=users.get_current_user()
  k=db.Key.from_path( Email ,u.user_id())
  e=Email.get(k)
  if not e:
    Email(key=k, email=u.email()).put()

def get_email_from_user_id(id):
     No way to derive email without a lookup.   
  k=db.Key.from_path( Email ,id)
  return Email.get(k).email # raises exception if email is not found

Answer 2

You can build a relationship between the email and the user_id,and then retrieve it as needed. If the user is logged in you can easily access both properties separately. http://code.google.com/intl/en/appengine/docs/python/users/userclass.html

Answer 3

然而,用户_id不是能够使用某种算法进行重建的电子邮件的 ha版。

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