GAE映像的服務器錯誤Python API

我嘗試使用Google App Engine示例Using the Images Python API，但遇到服務器錯誤。我試圖改變代碼，但感覺像原來的版本應該工作。有人知道什麼是錯的嗎？GAE映像的服務器錯誤Python API

我得到以下錯誤（XXXXX代表我的應用程序ID）：

Traceback (most recent call last): 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__ 
    rv = self.handle_exception(request, response, e) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__ 
    rv = self.router.dispatch(request, response) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher 
    return route.handler_adapter(request, response) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__ 
    return handler.dispatch() 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch 
    return self.handle_exception(e, self.app.debug) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch 
    return method(*args, **kwargs) 
    File "/base/data/home/apps/s~XXXXX/1.377139462267655901/main.py", line 35, in get 
    for greeting in greetings: 
    File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2326, in next 
    return self.__model_class.from_entity(self.__iterator.next()) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 1438, in from_entity 
    return cls(None, _from_entity=entity, **entity_values) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 970, in __init__ 
    prop.__set__(self, value) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 614, in __set__ 
    value = self.validate(value) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2845, in validate 
    % (self.name, type(value).__name__)) 
BadValueError: Property author must be a str or unicode instance, not a User

我main.py代碼：

import cgi 
import datetime 
import urllib 
import webapp2 

from google.appengine.ext import db 
from google.appengine.api import images 
from google.appengine.api import users 


class Greeting(db.Model): 
    """Models a Guestbook entry with an author, content, avatar, and date.""" 
    author = db.StringProperty() 
    content = db.StringProperty(multiline=True) 
    avatar = db.BlobProperty() 
    date = db.DateTimeProperty(auto_now_add=True) 


def guestbook_key(guestbook_name=None): 
    """Constructs a Datastore key for a Guestbook entity with guestbook_name.""" 
    return db.Key.from_path('Guestbook', guestbook_name or 'default_guestbook') 


class MainPage(webapp2.RequestHandler): 
    def get(self): 
     self.response.out.write('<html><body>') 
     guestbook_name=self.request.get('guestbook_name') 

     greetings = db.GqlQuery('SELECT * ' 
           'FROM Greeting ' 
           'WHERE ANCESTOR IS :1 ' 
           'ORDER BY date DESC LIMIT 10', 
           guestbook_key(guestbook_name)) 

     for greeting in greetings: 
      if greeting.author: 
       self.response.out.write(
        '<b>%s</b> wrote:' % greeting.author) 
      else: 
       self.response.out.write('An anonymous person wrote:') 
      self.response.out.write('<div><img src="img?img_id=%s"></img>' % 
            greeting.key()) 
      self.response.out.write('<blockquote>%s</blockquote></div>' % 
            cgi.escape(greeting.content)) 

     self.response.out.write(""" 
       <form action="/sign?%s" enctype="multipart/form-data" method="post"> 
       <div><textarea name="content" rows="3" cols="60"></textarea></div> 
       <div><label>Avatar:</label></div> 
       <div><input type="file" name="img"/></div> 
       <div><input type="submit" value="Sign Guestbook"></div> 
       </form> 
       <hr> 
       <form>Guestbook name: <input value="%s" name="guestbook_name"> 
       <input type="submit" value="switch"></form> 
      </body> 
      </html>""" % (urllib.urlencode({'guestbook_name': guestbook_name}), 
         cgi.escape(guestbook_name))) 


class Image(webapp2.RequestHandler): 
    def get(self): 
     greeting = db.get(self.request.get('img_id')) 
     if greeting.avatar: 
      self.response.headers['Content-Type'] = 'image/png' 
      self.response.out.write(greeting.avatar) 
     else: 
      self.response.out.write('No image') 


class Guestbook(webapp2.RequestHandler): 
    def post(self): 
     guestbook_name = self.request.get('guestbook_name') 
     greeting = Greeting(parent=guestbook_key(guestbook_name)) 

     if users.get_current_user(): 
      greeting.author = users.get_current_user().nickname() 

     greeting.content = self.request.get('content') 
     avatar = images.resize(self.request.get('img'), 32, 32) 
     greeting.avatar = db.Blob(avatar) 
     greeting.put() 
     self.redirect('/?' + urllib.urlencode(
      {'guestbook_name': guestbook_name})) 


app = webapp2.WSGIApplication([('/', MainPage), 
           ('/img', Image), 
           ('/sign', Guestbook)], 
           debug=True)

我的app.yaml代碼是（XXXXX代表我的應用程序ID ）：

application: XXXXX 
version: 1 
runtime: python27 
api_version: 1 
threadsafe: true 

handlers: 
- url: /.* 
    script: main.app 

# [START libraries] 
libraries: 
- name: webapp2 
    version: latest 
- name: jinja2 
    version: latest 
# [END libraries]

來源

2014-07-10 Nicolazinho

您應該使用一個一個db.UserProperty而不是db.StringProperty在你的模型班上。請參閱here完整的示例。

來源

2014-07-10 10:57:50 doru

非常感謝。它現在有效。這是否意味着https://developers.google.com/appengine/docs/python/images/usingimages上的代碼不正確？ – Nicolazinho

是的，這看起來不正確。如果我的回答有幫助，您可以接受它來解決問題。 – doru

GAE映像的服務器錯誤Python API

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