django.db.utils.IntegrityError：NOT NULL 约束失败：accounts_user.user_id

编程问答 2022-05-24

问题描述

我正在尝试在 django 中创建一个多用户模型。 我是 Django 的新手，因此无法获得我需要的确切结果。

尝试创建超级用户时出错。

这是我的models.py

from django.db import models
from django.contrib.auth.models import AbstractUser

ROLES =(
        ('main','Main'),('teacher','Teacher'),('student','Student'),)

这是我的寄存器和函数

def Register(request):
    if request.method == 'POST':
        form = RegistrationForm(request.POST)
        if form.is_valid():
            form.save()
            username = form.cleaned_data.get('username')
            first_name = form.cleaned_data.get('first_name')
            last_name = form.cleaned_data.get('last_name')
            password1 = form.cleaned_data.get('password1')
            messages.success(request,f'An account has successfully been created for {first_name} {last_name}. Username is {username} and password is {password1}')
            return redirect('login')
    else:
        form = RegistrationForm()
    return render(request,'register.html',{'form': form})

class School(models.Model):
    name = models.CharField(max_length=100,null=False,blank=False)

class User(AbstractUser):
    user = models.ForeignKey(School,on_delete=models.PROTECT,blank=False)
    role = models.CharField(max_length=10,choices=ROLES,blank=False,null=False)


class Teacher(models.Model):
    school = models.ForeignKey(School,blank=False)
    name  = models.CharField(max_length=30,null=False)
    code = models.CharField(max_length=30,null=False)


class Student(models.Model):
    school = models.ForeignKey(School,blank=False)
    first_name  = models.CharField(max_length=30,null=False)
    last_name = models.CharField(max_length=30,null=False)
    adm = models.CharField(max_length=30,null=False)

class Main(models.Model):
    school = models.ForeignKey(School,null=False)

我的 admin.py

from django.contrib import admin
from .models import User,School

admin.site.register(School)
admin.site.register(User)

尝试创建超级用户会引发以下回溯

(env) D:\Python\Django\Links Online Exams\Links_Online_Results>python manage.py createsuperuser
Username: ptar
Email address: [email protected]
Password:
Password (again):
Traceback (most recent call last):
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\backends\utils.py",line 84,in _execute
    return self.cursor.execute(sql,params)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\backends\sqlite3\base.py",line 413,in execute
    return Database.Cursor.execute(self,query,params)
sqlite3.IntegrityError: NOT NULL constraint failed: accounts_user.user_id

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py",line 22,in <module>
    main()
  File "manage.py",line 18,in main
    execute_from_command_line(sys.argv)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\core\management\__init__.py",line 401,in execute_from_command_line
    utility.execute()
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\core\management\__init__.py",line 395,in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\core\management\base.py",line 330,in run_from_argv
    self.execute(*args,**cmd_options)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\contrib\auth\management\commands\createsuperuser.py",line 79,in execute
    return super().execute(*args,**options)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\core\management\base.py",line 371,in execute
    output = self.handle(*args,**options)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\contrib\auth\management\commands\createsuperuser.py",line 189,in handle
    self.UserModel._default_manager.db_manager(database).create_superuser(**user_data)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\contrib\auth\models.py",line 157,in create_superuser
    return self._create_user(username,email,password,**extra_fields)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\contrib\auth\models.py",line 140,in _create_user
    user.save(using=self._db)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\contrib\auth\base_user.py",line 67,in save
    super().save(*args,**kwargs)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\base.py",line 753,in save
    self.save_base(using=using,force_insert=force_insert,File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\base.py",line 790,in save_base
    updated = self._save_table(
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\base.py",line 895,in _save_table
    results = self._do_insert(cls._base_manager,using,fields,returning_fields,raw)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\base.py",line 933,in _do_insert
    return manager._insert(
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\manager.py",line 85,in manager_method
    return getattr(self.get_queryset(),name)(*args,**kwargs)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\query.py",line 1254,in _insert
    return query.get_compiler(using=using).execute_sql(returning_fields)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\models\sql\compiler.py",line 1397,in execute_sql
    cursor.execute(sql,params)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\backends\utils.py",line 98,in execute
    return super().execute(sql,line 66,in execute
    return self._execute_with_wrappers(sql,params,many=False,executor=self._execute)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\backends\utils.py",line 75,in _execute_with_wrappers
    return executor(sql,many,context)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\backends\utils.py",params)
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\utils.py",line 90,in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "D:\Python\Django\Links Online Exams\env\lib\site-packages\django\db\backends\utils.py",params)
django.db.utils.IntegrityError: NOT NULL constraint failed: accounts_user.user_id

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