Question

platform: django 1.0, google app engine, app-engine-patch , python 2.5.4

i am tring to use the choices attribute as i always have been using in django website

STATUS_CHOICES = ( (1, _('Yet To Start')), (2, _('Running')), (3, _('Paused')), (4, _('Completed')), (5, _('Cancelled')), (6, _('Error')),)

class Campaign(db.Model):
    name = db.TextProperty()
    status = db.IntegerProperty(choices=STATUS_CHOICES,default=2)

now as i have moved to app-engine i dont see this is working…

i am getting a

BadValueError

Property status is 3; must be one of
((1, u’Yet To Start’), (2,
u’Running’), (3, u’Paused’), (4,
u’Completed’), (5, u’Cancelled’), (6,
u’Error’))

how shud i go about this problem?

Answer 1

This is a documented problem that will not be resolved. Simply put, you can’t do this when using GAE.

Guido says the following when closing the above ticket:

I’m very sorry, but I have to close this as invalid.

The App Engine definition of the choices parameter to the db.Property class is
different from the Django definition. See
http://code.google.com/appengine/docs/datastore/propertyclass.html#Property

I realize that this may cause problems when you’re trying to create a form from the
model, but the solution is to override the form field using a custom widget and
passing the list of desired choices to the widget. (There’s an example of this in
Rietveld, in codereview/views.py, class SettingForm.)