On Tue, Jul 6, 2010 at 3:51 AM, jcage <[email protected]> wrote:
> Hi everyone. I'm quite new to python and django. I was wondering if
> anyone could shed some light on this topic :
>
> My models.py contains the classes QuestionSet and Question, which
> inherits the former.
> In the shell, I define a Question object as follows
>
> q1 = Question(script = "How are you?", comment = "no comment", order =
> 1)
>
>
> but an attempt to run q1.save() results in the following error :
>
>>>> q1.save()
> Traceback (most recent call last):
> File "<console>", line 1, in <module>
> File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/site-packages/django/db/models/base.py", line 435, in save
> self.save_base(using=using, force_insert=force_insert,
> force_update=force_update)
> File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/site-packages/django/db/models/base.py", line 447, in
> save_base
> using = using or router.db_for_write(self.__class__,
> instance=self)
> File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/site-packages/django/db/utils.py", line 133, in _route_db
> return hints['instance']._state.db or DEFAULT_DB_ALIAS
> AttributeError: 'Question' object has no attribute '_state'
>
>
>
> The class definitions are :
>
> class QuestionSet(models.Model):
> title = models.CharField(max_length=100)
> description = models.TextField()
> order = models.IntegerField()
>
> def __init__(self, *args, **kwargs):
> self.title = kwargs.get('title','Default Title')
> self.description = kwargs.get('description', 'DefDescription')
> self.order = kwargs.get('order', 0)
>
>
> class Question(QuestionSet):
> script = models.CharField(max_length=200)
> comment = models.TextField()
>
>
> def __init__(self, *args, **kwargs):
> QuestionSet.__init__(self, args, kwargs)
> self.script = kwargs.get('script', "undefined")
> self.comment = kwargs.get('comment', "no comment")
>
>
>
>
> Would greatly appreciate any suggestions
>
You aren't calling the django.db.models.Model constructor on either of
your derived classes. When you write a derived class, be sure to call
the super class constructor:
class MyModel(Model):
def __init__(self, *args, **kwargs):
super(MyModel, self).__init__(*args, **kwargs)
Cheers
Tom
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