Question

I’m working through https://docs.djangoproject.com/en/1.4/intro/tutorial01/ .

Towards the end of the tutorial is a section on the django DB api there is the following:

# Display any choices from the related object set -- none so far.
>>> p.choice_set.all()
[]

# Create three choices.
>>> p.choice_set.create(choice_text='Not much', votes=0)
<Choice: Not much>

However when I directly copy : >>> p.choice_set.create(choice_text=’Not much’, votes=0) from the tutorial, I get:

raise TypeError("'%s' is an invalid keyword argument for this function" % kw
args.keys()[0])
TypeError: 'choice_text' is an invalid keyword argument for this function

previously everything in the tut worked as expected.

Any idea what the problem is ? I’m pretty new to python coming from a php background with some OOP experience.

Thanks in advance,

Bill

Answer 1

Are you sure you are copying directly from the tutorial. It looks like it is choice= instead of choice_text=

# Create three choices.
>>> p.choice_set.create(choice='Not much', votes=0)
<Choice: Not much>
>>> p.choice_set.create(choice='The sky', votes=0)
<Choice: The sky>

The model is:

class Choice(models.Model):
    poll = models.ForeignKey(Poll)
    choice = models.CharField(max_length=200)
    votes = models.IntegerField()

So what this line is doing is by using choice_set.create() (link to docs), it’s creating a Choice model and taking the poll – p – and assigning that as the model field poll (the foreign key). And then assigning the choice= value to the model field choice, and the votes= value to the model field votes.