i'm learning django using djangobook <http://djangobook.com>, in chapter
6, i'm having this error:
IntegrityError at /admin/books/book/add/
NOT NULL constraint failed: books_book.publication_date
it seems i should set null=True for publication_date field. but i did it
already, this is my models.py:
from django.db import models
class Publisher(models.Model):
name = models.CharField(max_length=30)
address = models.CharField(max_length=50)
city = models.CharField(max_length=60)
state_province = models.CharField(max_length=30)
country = models.CharField(max_length=50)
website = models.URLField()
def __unicode__(self):
return self.name
class Author(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=40)
email = models.EmailField(blank=True, verbose_name='e-mail')
def __unicode__(self):
return u'%s %s' % (self.first_name, self.last_name)
class Book(models.Model):
title = models.CharField(max_length=100)
authors = models.ManyToManyField(Author)
publisher = models.ForeignKey(Publisher)
publication_date = models.DateField(blank=True, *null=True*)
def __unicode__(self):
return self.title
what am i doing wrong?
i googled the error message but didn't find a related answer.
thank you for your help.
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