我一直在尝试使用webapp2在会话中存储用户数据 我试图在会话数据中存储父对象的密钥：
self.session['client'] = client.key
但我一直得到：
TypeError: Key('Client', 6401356696911872) is not JSON serializable
如何在会话中存储实体密钥？
我的代码相当简单：
import os
import urllib
import logging
from google.appengine.api import users
from google.appengine.ext import ndb
import jinja2
import webapp2
from webapp2_extras import sessions
class BaseHandler(webapp2.RequestHandler):
def dispatch(self):
self.session_store = sessions.get_store(request=self.request)
try:
# dispatch the request
webapp2.RequestHandler.dispatch(self)
finally:
# save all sessions
import pdb; pdb.set_trace()
self.session_store.save_sessions(self.response)
@webapp2.cached_property
def session(self):
# Returns a session using the default cookie key.
return self.session_store.get_session()
JINJA_ENVIRONMENT = jinja2.Environment(
loader = jinja2.FileSystemLoader(os.path.dirname(__file__)),
extensions=['jinja2.ext.autoescape'],
autoescape=True)
DEFAULT_LEADBOOK_NAME = 'whatsmyname'
def leadbook_key(leadbook_name=DEFAULT_LEADBOOK_NAME):
"""Constructs a Datastore key for a LeadBook entity with leadbook_name."""
return ndb.Key('LeadBook', leadbook_name)
class Client(ndb.Model):
email = ndb.StringProperty()
name = ndb.StringProperty(indexed=True)
street1 = ndb.StringProperty()
street2 = ndb.StringProperty()
city = ndb.StringProperty()
zipcode = ndb.IntegerProperty()
phone = ndb.StringProperty()
signup = ndb.DateTimeProperty(auto_now_add=True)
# this just creates a Client to use
if not ( Client.query( Client.name == "Bryan Wheelock").get()):
logging.info("create Admin")
client = Client(
email = "bryan@mail.com",
name = "Bryan Wheelock",
street1 = "555 Main St",
street2 = "unit 1",
city = "Atlanta",
zipcode = 99999,
phone = "(888)555-1212"
).put()
class Customer(ndb.Model):
client = ndb.KeyProperty(kind=Client)
email = ndb.StringProperty(indexed=True)
name = ndb.StringProperty(indexed=True)
street1 = ndb.StringProperty()
street2 = ndb.StringProperty()
city = ndb.StringProperty()
zipcode = ndb.IntegerProperty()
phone = ndb.StringProperty()
signup = ndb.DateTimeProperty(auto_now_add=True)
class MainPage(BaseHandler):
def get(self):
leadbook_name = self.request.get('leadbook_name',
DEFAULT_LEADBOOK_NAME)
# This should be the Client record that shows the info of the owner of the local clinic
# the question is how do I get the site to show the correct Client?
client = Client.query( Client.name == "Bryan Wheelock").get()
self.session['client'] = client.key
template_values = {
'client': client,
'leadbook_name': urllib.quote_plus(leadbook_name),
}
template = JINJA_ENVIRONMENT.get_template('index.html')
self.response.write(template.render(template_values))
class LeadBook(webapp2.RequestHandler):
def post(self):
leadbook_name = self.request.get('leadbook_name',
DEFAULT_LEADBOOK_NAME)
client = self.session.get('client')
cl = Client.query(client.key )
customer = Customer( client = cl.key)
customer.name = self.request.get('id_name')
customer.street = self.request.get('id_street')
customer.phone = self.request.get('id_phone')
customer.zip = self.request.get('id_zip')
import pdb; pdb.set_trace()
# How can I see the number of Customers before and after save?
customer.put()
query_params = {'leadbook_name': leadbook_name}
self.redirect('/?' + urllib.urlencode(query_params))
config = {}
config['webapp2_extras.sessions'] = {
'secret_key': 'my-super-secret-key',
}
application = webapp2.WSGIApplication([
('/', MainPage),
('/sign', LeadBook),
], config = config,
debug=True)
Traceback (most recent call last):
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1102, in __call__
return handler.dispatch()
File "/Users/Bryan/work/GoogleAppEngine/dermalfillersecrets/main.py", line 22, in dispatch
self.session_store.save_sessions(self.response)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/sessions.py", line 420, in save_sessions
session.save_session(response)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/sessions.py", line 205, in save_session
response, self.name, dict(self.session), **self.session_args)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/sessions.py", line 423, in save_secure_cookie
value = self.serializer.serialize(name, value)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/securecookie.py", line 47, in serialize
value = self._encode(value)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/securecookie.py", line 92, in _encode
return json.b64encode(value)
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/json.py", line 84, in b64encode
return base64.b64encode(encode(value, *args, **kwargs))
File "/Users/Bryan/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2_extras/json.py", line 55, in encode
return json.dumps(value, *args, **kwargs).replace("</", "<\\/")
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 250, in dumps
sort_keys=sort_keys, **kw).encode(obj)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py", line 207, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py", line 270, in iterencode
return _iterencode(o, 0)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py", line 184, in default
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: Key('Client', 6401356696911872) is not JSON serializable
答案 0 :(得分：4)
使用密钥的urlsafe版本：
https://cloud.google.com/appengine/docs/python/ndb/entities#retrieving_entities
self.session['client'] = client.key.urlsafe()
在检索时，请使用
client = ndb.Key(urlsafe=self.session['client']).get()