GoogleAppEngine data store isn't returning any records
I'm learning how to use the GoogleAppEngine with Python as the language of choice.
Here's my code:
import cgi
from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db
class Greeting(db.Model):
author = db.UserProperty()
content = db.StringProperty(multiline=True)
date = db.DateTimeProperty(auto_now_add=True)
class BlogPost(db.Model):
author = db.UserProperty();
body = db.StringProperty(multiline=True)
postDate = db.DateTimeProperty(auto_now_add=True)
class MainPage(webapp.RequestHandler):
def get(self):
self.response.out.write('<html><body>')
blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY date DESC LIMIT 10")
greetings开发者_如何学Python = db.GqlQuery("SELECT * FROM Greeting ORDER BY date DESC LIMIT 10")
for post in blogPosts:
if post.author:
self.response.out.write('<b>%s</b>' % post.author.nickname())
else:
self.response.out.write('<b>A guest wrote:</b>')
self.response.out.write(cgi.escape(post.body))
# Write the submission form and the footer of the page
self.response.out.write("""
<form action="/sign" method="post">
<div><textarea name="content" rows="3" cols="60"></textarea></div>
<div><input type="submit" value="Sign Guestbook"></div>
</form>
</body>
</html>""")
class Guestbook(webapp.RequestHandler):
def post(self):
post = BlogPost()
if users.get_current_user():
post.author = users.get_current_user()
post.body = self.request.get('content')
post.put()
self.redirect('/')
application = webapp.WSGIApplication(
[('/', MainPage),
('/sign', Guestbook)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
I wanted to add a BlogPost class just to test things out for myself, and it seems no record is being saved to the data store. I'm using Komodo Edit as my IDE so I can't use a breakpoint.
Any glaring mistakes?
Thank you!
Well, first of all I'm getting error the following log error (it maybe is just for me):
dev_appserver_main.py:466] <class 'google.appengine.api.datastore_errors.InternalError'>
Are you using FloatProperty and/or GeoPtProperty? Unfortunately loading float values from the datastore file does not work with Python 2.5.0.
Had to get rid of it using the -c flag.
Second, why do you still have the Greeting dbModel? You're not using it. Might as well just remove it.
But the real mistake is in the query blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY date DESC LIMIT 10") you have no date row. Look what you named it:
postDate = db.DateTimeProperty(auto_now_add=True)
Modify your request to say: blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY postDate DESC LIMIT 10") and it will work like a charm. Hope this helped.
加载中,请稍侯......
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