Question

Here is my Django model

class author(models.Model):
    name = models.CharField('name',max_length=140)
    datamode = models.CharField(max_length=1, default='A', choices=DATAMODE_CHOICE)

    def __str__(self):
        return '%s' % (self.name)

While I use this class author as a foreign key in another class as follows:

class books(models.Model):
    NEW_FLAG=(('N','New'),('O','Old'))
    name = models.CharField('name',max_length=140)
    author = models.ForeignKey(author, blank=True, null=True)

When I enter the new book details in admin it shows:

IntegrityError: Column 'author_id' cannot be null.

Answer 1

Now it’s working i simply dropped my database and again i created a newone. Anyway thanks to everyone.