Mike Cantelon

This is a port of the Django tutorial to use appengine instead of Pure Django. Like in the Django tutorial, we build a poll engine, where you can create polls and others can vote for them. Instead of the four part Django tutorial, we use only one tutorial. Also, as many parts of Django, most prominently its super Admin interface do not work, we will work around them. I will assume that you know python well. However I do not assume that you have previous experience with Django. Django concepts are explained. 70-647 What will we build
We will build a Poll engine, where people can create polls, and vote on the options. Essentially this has four types of pages,
1. A listing of the recently created polls.
2. A page where you can create new pages.
3. A page with the choices, and for voting.
4. A page with the results.
A live install of this can be see on blogango.appspot.com The complete source for this can be downloaded from here
Downloading Django, 70-236 and Appengine Downlaoding Django is very well documented, so I will not repeat it here. And you have already downloaded Appengine, right? Though downloading Django is a not required for this tutorial, as appengien has django 0.96 built in with it.
Getting Help If you are having trouble with this tutorial, please ask in Django forum and some one from Django community would be able to help you , or leave a comment on 42topics.com blog, and I will try to help you.
Creating a project Create a directory where you would like to keep all your Appengine and Django files. Inside of this directory, run the command: django-admin.py startproject appproject 642-825 This would create a directory called appproject which would contain files used by Django. We will look at these files in a moment, but before that we need to create two more files. Create a file called main.py at the same level as the folder appproject, and put this code.:
mport os,sys
os.environ['DJANGO_SETTINGS_MODULE'] = 'appproject.settings'

# Google App Engine imports.
from google.appengine.ext.webapp import util

# Force Django to reload its settings.
from django.conf import settings
settings._target = None

import django.core.handlers.wsgi
import django.core.signals
import django.db
import django.dispatch.dispatcher

# Log errors.
#django.dispatch.dispatcher.connect(
# log_exception, django.core.signals.got_request_exception)

# Unregister the rollback event handler.
django.dispatch.dispatcher.disconnect(
django.db._rollback_on_exception,
django.core.signals.got_request_exception)

def main():
# Create a Django application for WSGI.
application = django.core.handlers.wsgi.WSGIHandler()

# Run the WSGI CGI handler with that application.
util.run_wsgi_app(application)

if __name__ == '__main__':
main()

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I solved my problem - the urls.py file is not able to generate a decent error on a url that is not written in parenthesis.

I did
r'^contacts/', 'myproject.contacts.views.main'.

instead of:

(r'^contacts/', 'myproject.contacts.views.main').

Code 18
works fine now.

This is going to be helpful.

Do you have any idea how you would retrieve fields from a database and map it into a CSS form?

Kind of for: (string1,string2,string_n); ask string.color

and it would retrieve the strings from a table.

f.

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I am looking for a project based application which will be embedded by several scripts, also looking for some java based applications for the new projects,nice post.was an article I liked. Thanks for sharing.
tüp bebek

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Thanks for the complete example - looks good! I will check it out and see if this works. Do you need any additional patches?

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You shouldn't need any additional patches, but you need the latest version of Django from Subversion (not the latest release version).

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Thanks, Mike! I found that very helpful. I came across your link in the comments to the Newforms documentation, so it's a good thing you put it there :-)

Do you only have anonymous comments? I can't see where to put my name in. I'm evariste.

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I am looking for a project based application which will be embedded by several scripts, also looking for some java based applications for the new projects,nice post.

• reply