Hi Jason, and Thank You for taking time to help a noob out. I've gone over
everything again and I guess I'm not understanding where to define the
guestbook name.
In a previous part of the tutorial I did add comments to a guestbook called
'Guestbook', so there should be data to retrieve from what I thought was
the default guestbook
name. The tutorial doesn't say anything about adding or changing the code
presented. I think it's meant to be idiot proof, but once again I seem to
have proven them
(makers of coding tutorials) wrong. Here's my code which returns the same
error as outlined before.
import jinja2
import os
jinja_environment = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__)))
import cgi
import datetime
import urllib
import webapp2
from google.appengine.ext import db
from google.appengine.api import users
class Greeting(db.Model):
"""Models an individual Guestbook entry with an author, content, and
date."""
author = db.StringProperty()
content = db.StringProperty(multiline=True)
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):
guestbook_name=self.request.get('guestbook_name')
greetings_query = Greeting.all().ancestor(
guestbook_key(guestbook_name)).order('-date')
greetings = greetings_query.fetch(10)
if users.get_current_user():
url = users.create_logout_url(self.request.uri)
url_linktext = 'Logout'
else:
url = users.create_login_url(self.request.uri)
url_linktext = 'Login'
template_values = {
'greetings': greetings,
'url': url,
'url_linktext': url_linktext,
}
template = jinja_environment.get_template('index.html')
self.response.out.write(template.render(template_values))
# Ancestor Queries, as shown here, are strongly consistent with the High
# Replication Datastore. Queries that span entity groups are eventually
# consistent. If we omitted the ancestor from this query there would be
a
# slight chance that Greeting that had just been written would not show
up
# in a query.
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('<blockquote>%s</blockquote>' %
cgi.escape(greeting.content))
self.response.out.write("""
<form action="/sign?%s" method="post">
<div><textarea name="content" rows="3"
cols="60"></textarea></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 Guestbook(webapp2.RequestHandler):
def post(self):
# We set the same parent key on the 'Greeting' to ensure each greeting
is in
# the same entity group. Queries across the single entity group will be
# consistent. However, the write rate to a single entity group should
# be limited to ~1/second.
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')
greeting.put()
self.redirect('/?' + urllib.urlencode({'guestbook_name':
guestbook_name}))
app = webapp2.WSGIApplication([('/', MainPage),
('/sign', Guestbook)],
debug=True)
*Additionally there is the yaml file:*
application: helloworld
version: 1
runtime: python27
api_version: 1
threadsafe: true
handlers:
- url: /.*
script: helloworld.app
libraries:
- name: jinja2
version: 2.6
*
And an index.html*
<html>
<body>
{% for greeting in greetings %}
{% if greeting.author %}
<b>{{ greeting.author }}</b> wrote:
{% else %}
An anonymous person wrote:
{% endif %}
<blockquote>{{ greeting.content|escape }}</blockquote>
{% endfor %}
<form action="/sign" method="post">
<div><textarea name="content" rows="3" cols="60"></textarea></div>
<div><input type="submit" value="Sign Guestbook"></div>
</form>
<a href="{{ url }}">{{ url_linktext }}</a>
</body>
</html>
On Friday, July 13, 2012 3:18:12 PM UTC-7, Jason Elbourne wrote:
>
>
> I have not run the code in the tutorial but it looks fine to me. The error
> you have received leads me to think you do not have the variable assigned
> for 'guestbook_name'
>
> guestbook_name=self.request.get('guestbook_name')
>
> this will give you 'None' or the actual name if it has been passed.
>
> The error occurred during the function call for guestbook_key()
>
> So make sure you have that function in your code:
>
> 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')
>
>
> And if all of that is in your code then I am not sure what else it could
> be without seeing all the code.
>
>
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