Question

我正在尝试创建一个彩票应用程序，它一直工作正常，但今天当我尝试做一个python manage.py迁移lotteryapp它开始产生一个错误，说明

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

所以我删除了所有电子邮件的引用，看看是否会修复它，但它仍然会出错。然后，我一起删除了数据库并重新启动，但随后又出现了此错误

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

我已经进入了我的models.py文件并返回并再次运行该命令，它再次给出了重复的列错误。它没有任何意义。这是来自models.py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

IntegerField不能包含默认字符串类型，也没有 max_length 属性：
- winner_numbers = models.IntegerField（default =“”）
- winner_telephone = models.IntegerField（max_length = 15，默认=“”）
- telephone = models.IntegerField（默认=“”）
- lottery_numbers = models.IntegerField（default =“”）
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 我尝试了以下代码我刚刚将用户更改为 UserModel ，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

Django Migrations产生奇怪的错误

2 个答案: