int()的基数为10的无效文字 - django - 已更新

Question

我是一个django初学者,我正在尝试制作一个像父母一样的组合框,(酒吧取决于城市取决于国家),我得到这个错误.

更新:更改了外键的模型和默认值,但仍然是相同的错误.有帮助吗？谢谢!

这是models.py:

from django.db import models
from smart_selects.db_fields import ChainedForeignKey

DEFAULT_COUNTRY_ID = 1 # id of Israel
class BarName(models.Model):
    name = models.CharField(max_length=20)
    def __unicode__(self):
        return self.name

class Country(models.Model):
    country = models.CharField(max_length=20)
    def __unicode__(self):
        return self.country

class City(models.Model):
    city = models.CharField(max_length=20)
    country = models.ForeignKey(Country, default=DEFAULT_COUNTRY_ID)
    def __unicode__(self):
        return self.city

class Bar(models.Model):
    country = models.ForeignKey(Country)
    city = ChainedForeignKey(City, chained_field='country' , chained_model_field='country', auto_choose=True)
    name = ChainedForeignKey(BarName, chained_field='city', chained_model_field='city', auto_choose=True)

    def __unicode__(self):
        return '%s %s %s' % (self.name, self.city, self.country)
    class Admin:
        pass

从运行'python manage.py migrate':

?  baromatix  python manage.py migrate       
Operations to perform:
  Apply all migrations: admin, bars, contenttypes, auth, sessions
Running migrations:
  .......

    value = self.get_prep_value(value)
  File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 915, in get_prep_value
    return int(value)
ValueError: invalid literal for int() with base 10: 'DEFAULT VALUE'

Answer 1

我在删除django创建的旧迁移文件时解决了这个问题.