问题描述
我首先实现了用户模型和身份验证,并将一些用户添加到数据库中。然后我在模型中添加了两个字段,“城市”和“公司”,并在它们之间设置了外键关系。如果我通过管理站点创建的用户没有公司/城市,那没关系,但是如果用户是使用表单创建的,我希望该字段是必需的。所以我设置了 null=True 和 blank=False。这是我完整的 models.py 文件:
from django.db import models
from django.contrib.auth.models import AbstractBaseUser,BaseUserManager
from django.core.validators import MinLengthValidator
class UserManager(BaseUserManager):
def create_user(self,first_name,last_name,email,rollNo,password=None):
if not email:
raise ValueError("Users must have an email")
if not rollNo:
raise ValueError("Users must have a roll number")
if not first_name:
raise ValueError("Users must have a first name")
if not last_name:
raise ValueError("Users must have a last name")
user = self.model(
first_name=first_name,last_name=last_name,email=self.normalize_email(email),rollNo=rollNo
)
user.set_password(password)
user.save(using=self._db)
return user
def create_superuser(self,is_current,password):
user = self.model(
is_current=is_current,first_name=first_name,password=password
)
user.is_admin = True
user.is_staff = True
user.is_superuser = True
user.set_password(password)
user.save(using=self._db)
return user
class Company(models.Model):
name = models.CharField(max_length=50,default="NAME")
people = models.ManyToManyField('Person',default=None,related_name='employes',null=True)
def __str__(self):
return self.name
class City(models.Model):
name = models.CharField(max_length=50,default="NAME")
companies = models.ManyToManyField(Company,related_name='located_at',null=True)
people = models.ManyToManyField('Person',related_name='residents',null=True)
def __str__(self):
return self.name
class Person(AbstractBaseUser):
first_name = models.CharField(max_length=15,default="NAME",null=False,blank=False)
last_name = models.CharField(max_length=15,blank=False)
email = models.EmailField(unique=True,blank=False)
username = models.CharField(max_length=30,unique=True,null=True,blank=True)
date_joined = models.DateTimeField(verbose_name='date_joined',auto_Now_add=True,blank=True)
last_login = models.DateTimeField(verbose_name='last_login',blank=True)
is_admin = models.BooleanField(default=False)
is_active = models.BooleanField(default=True)
is_staff = models.BooleanField(default=False)
is_superuser = models.BooleanField(default=False)
is_current = models.BooleanField(default=True)
batch = models.IntegerField(null=True,blank=True)
facebook_profile = models.URLField(null=True,blank=True)
instagram_profile = models.URLField(null=True,blank=True)
linkedin_profile = models.URLField(null=True,blank=True)
city = models.ForeignKey(City,on_delete=models.CASCADE,blank=False)
company = models.ForeignKey(Company,blank=False)
first = 1
second = 2
third = 3
fourth = 4
YEAR_CHOICES = (
(first,'first'),(second,'second'),(third,'third'),(fourth,'fourth')
)
year = models.IntegerField(choices=YEAR_CHOICES,blank=True)
CSE = 'CSE'
ECE = 'ECE'
IT = 'IT'
Branch_CHOICES = (
(CSE,'CSE'),(ECE,'ECE'),(IT,'IT')
)
branch = models.CharField(max_length=3,choices=Branch_CHOICES,default="CSE",blank=True)
rollNo = models.CharField(validators=[MinLengthValidator(5)],max_length=5,blank=True)
image = models.URLField(blank=True,null=True)
#content_type = models.CharField(max_length=256,help_text='The MIMEType of the file')
USERNAME_FIELD = 'email'
required_FIELDS = ['is_current','first_name','last_name']
objects = UserManager()
def __str__(self):
return self.rollNo
def has_perm(self,perm,obj=None):
return self.is_admin
def has_module_perms(self,app_label):
return True
当我运行 makemigrations 时,一切正常。但是当我运行迁移时,我得到:
sqlite3.IntegrityError: NOT NULL 约束失败: new__network_person.city_id
我无法删除所有迁移并重新开始。有没有其他方法可以解决这个问题? 另外,我真的不明白为什么会发生这个异常,我已经设置了 null=True。如果有人可以解释发生此错误的原因,那将非常有帮助。正如我所说,我之前有一个带有 Person 模型的表,并且我添加了 City 和 Company 后记。
谢谢
解决方法
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