Django Migrations 产生奇怪的错误

Question

我正在尝试创建一个彩票应用程序，它一直运行良好，但是今天当我尝试执行 python manage.py migrate lotteryapp 时，它开始产生一个错误，指出

django.db.utils.OperationalError: (1060, "Duplicate column name 'email'")

所以我删除了电子邮件的所有引用，看看是否可以修复它，但它仍然给出错误。然后我一起删除了数据库并重新开始，但它给出了这个错误

ValueError: invalid literal for int() with base 10: ''

我已经进入了我的 models.py 文件并退出并再次运行该命令，它再次给出了重复列错误。这没有任何意义。这是我在 models.py 中的代码：

from django.db import models
from django.utils import timezone
from datetime import datetime

class Lottery(models.Model):
    name = models.CharField(default="", max_length=50)
    date_drawn = models.DateTimeField(default=datetime.now,blank=True)
    win_amount = models.IntegerField(default=0)
    winning_numbers = models.IntegerField(default="")
    def __unicode__(self):
        return self.name

class Winner(models.Model):
    first_name = models.CharField(max_length=100, default="")
    last_name = models.CharField(max_length=100, default="")
    winner_telephone = models.IntegerField(max_length=15, default="")
    lottery_numbers = models.IntegerField(default=0)
    lottery_won = models.CharField(max_length=50, default="") 
    def __unicode__(self):
        return self.name

class User(models.Model):
    first_name = models.CharField(max_length=100, default="")
    last_name = models.CharField(max_length=100, default="")
    telephone = models.IntegerField(default="")
    def __unicode__(self):
        return self.first_name

class entered_user(models.Model):
    first_name = models.CharField(max_length=100, default="")
    last_name = models.CharField(max_length=100, default="")
    telephone = models.IntegerField(default="")
    lottery_numbers = models.IntegerField(default="")
    def __unicode__(self):
        return self.first_name

Answer 1

问题在于字段lottery_won 和lottery_numbers。将默认值更改为 0，然后重试。

Answer 2

1. IntegerField 不能有 default 字符串类型，也没有属性 ma​​x_length ：

   • winning_numbers = models.IntegerField(default="")
   • winner_telephone = models.IntegerField(max_length=15, default="")
   • telephone = models.IntegerField(default="")
   • lottery_numbers = models.IntegerField(default="")

2. 避免调用您的模型用户，因为它可能会导致与默认的 django 用户模型冲突，这可能是电子邮件错误消息的原因。

@CNB 我尝试了如下代码我只是将 User 更改为 UserModel 并且迁移工作正常：

from __future__ import unicode_literals
from django.db import models
from django.db import models
from django.utils import timezone
from datetime import datetime

class Lottery(models.Model):
   name = models.CharField(default="", max_length=50)
   date_drawn = models.DateTimeField(default=datetime.now,blank=True)
   win_amount = models.IntegerField(default=0)
   winning_numbers = models.IntegerField(default=0)
   def __unicode__(self):
       return self.name

class Winner(models.Model):
    first_name = models.CharField(max_length=100, default="")
    last_name = models.CharField(max_length=100, default="")
    winner_telephone = models.IntegerField(default="")
    lottery_numbers = models.IntegerField(default=0)
    lottery_won = models.CharField(max_length=50, default="")
    def __unicode__(self):
        return self.name

class UserModel(models.Model):
    first_name = models.CharField(max_length=100, default="")
    last_name = models.CharField(max_length=100, default="")
    telephone = models.IntegerField(default=0)
    def __unicode__(self):
        return self.first_name

class entered_user(models.Model):
    first_name = models.CharField(max_length=100, default="")
    last_name = models.CharField(max_length=100, default="")
    telephone = models.IntegerField(default=0)
    lottery_numbers = models.IntegerField(default=0)
    def __unicode__(self):
        return self.first_name