Question

django唯一约束失败salebook_saleman.user_id

model.py：

class Saleman(models.Model):
    name = models.CharField(max_length=200)
    password = models.CharField(max_length=200)

    def __str__(self):              
        return self.name

class Book(models.Model):
    owner = models.ForeignKey(Saleman)
    book_name = models.CharField(max_length=200)
    book_text = models.TextField(max_length=2000,blank=True)
    price = models.IntegerField(default=0)
    telephone = models.CharField(max_length=200)
    #image = models.ImageField(upload_to='photos')
    pub_date = models.DateTimeField('date published',default = timezone.now)

    def __str__(self):
        return self.book_name

view.py：

def user_register(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        email = request.POST['email']
        new_user = User.objects.create_user(username,email,password)
        new_saleman = Saleman.objects.create(name=username,password=password)
        if newsaleman is not None:
            new_saleman.save()
        if new_user is not None:
            new_user.save()
            context = {'Username':username}
            return render(request,"salebook/index.html",context)
    else:
        context = {'error_message':'Register Fail'}
        return render(request,"salebook/register.html",context)


def user_login(request):
if request.method == 'POST':
    username = request.POST['username']
    password = request.POST['password']
    user = authenticate(username=username, password=password)
    if user is not None:
        if user.is_active:
            login(request, user)
            context = {'Username':username}
            return render(request,"salebook/index.html",context)
        else:
            context = {'error_message':'User is locked'}
            return render(request,"salebook/login.html",context)
    else:
        context = {'error_message':'Null User or Wrong Password'}
        return render(request,"salebook/login.html",context)
else:
    return render_to_response('salebook/login.html')

不确定它的含义或原因是什么。如果有一个简单的解决方法，请告诉我。谢谢！更新：错误是：

 File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 367, in execute_from_command_line
utility.execute()
File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 359, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python27\lib\site-packages\django\core\management\base.py", line 294, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Python27\lib\site-packages\django\core\management\base.py", line 345, in execute
output = self.handle(*args, **options)
File "C:\Python27\lib\site-packages\django\core\management\commands\migrate.py", line 204, in handle
fake_initial=fake_initial,
File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "C:\Python27\lib\site-packages\django\db\migrations\migration.py", line 129, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "C:\Python27\lib\site-packages\django\db\migrations\operations\fields.py", line 84, in database_forwards
field,
File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\schema.py", line 231, in add_field
self._remake_table(model, create_fields=[field])
File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\schema.py", line 199, in _remake_table
self.quote_name(model._meta.db_table),
File "C:\Python27\lib\site-packages\django\db\backends\base\schema.py", line 112, in execute
cursor.execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\base.py", line 337, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: UNIQUE constraint failed:salebook_saleman.user_id

首先，我尝试使用abstractUser扩展我的模型销售人员，并且发生了这个错误。当我重做代码时，它仍然存在。很抱歉，我不知道我的代码发生了什么。

Answer 1

看起来您的Saleman模型曾经为用户模型提供了外键或一对一字段。您需要创建一个新的迁移，然后运行它以从数据库中删除该字段。

./manage.py makemigrations salebook
./manage.py migrate

Answer 2

似乎你已经失去了一个＆＃39; _＆＃39;在这里：

if newsaleman is not None:
        new_saleman.save()

django唯一约束失败user_id

2 个答案: