Question

I am trying schemamigration with south on my model
(I am using django 1.4 and python 2.6 on ubuntu)

Initially my model was

class Review(models.Model):
    reviewdate=models.DateField(default=date.today)
    description=models.TextField()
    author=models.ForeignKey(User,null=True)

I added a field

from django.core.validators import MinValueValidator,MaxValueValidator

class Review(models.Model):
    reviewdate=models.DateField(default=date.today)
    description=models.TextField()
    author=models.ForeignKey(User,null=True)
    rating = models.IntegerField(MinValueValidator(1),MaxValueValidator(10),default=5,help_text='integers 1 to 10')

when I run

python manage.py schemamigration myapp --auto

I get this TypeError

...
File "/home/me/Django-1.4/django/db/models/base.py", line 198, in __new__
    new_class._prepare()
  File "/home/me/Django-1.4/django/db/models/base.py", line 255, in _prepare
    cls.__doc__ = "%s(%s)" % (cls.__name__, ", ".join([f.attname for f in opts.fields]))
TypeError: Error when calling the metaclass bases
    sequence item 6: expected string, MaxValueValidator found

Can someone please tell me where I am wrong?

Answer 1

Your syntax is incorrect. You should provide the validators as a list to the validators argument:

models.IntegerField(validators=[MinValueValidator(1), MaxValueValidator(10)], default=5, help_text='integers 1 to 10')

For more information, see the docs for using validation in practice.