django 1.5中的自定义用户模型

class MyUserManager(BaseUserManager):

   def create_user(self,email,password=None):

     if not email:
        raise ValueError('Users must have an email address')

     user = self.model(
        email=MyUserManager.normalize_email(email),)

     user.set_password(password)
     user.save(using=self._db)
     return user

   def create_superuser(self,password):

     user = self.create_user(email,password=password
     )
     user.is_admin = True
     user.save(using=self._db)
     return user


 class MyUser(AbstractBaseUser):
    email = models.EmailField(
      verbose_name='Email address',max_length=255,unique=True,db_index=True,)
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)

    objects = MyUserManager()

    USERNAME_FIELD = 'email'

    def get_full_name(self):
      # The user is identified by their email address
      return self.email

    def __unicode__(self):
      return self.email

我的admin.py如下所示.

class MyUserAdmin(UserAdmin):
   # The forms to add and change user instances
   form = UserChangeForm
   add_form = UserCreationForm

   # The fields to be used in displaying the User model.
   # These override the deFinitions on the base UserAdmin
   # that reference specific fields on auth.User.
   list_display = ('email','is_admin')
   list_filter = ('is_admin',)
   fieldsets = (
     (None,{'fields': ('email','password')}),('Permissions',{'fields': ('is_admin',)}),('Important dates',{'fields': ('last_login',)
   add_fieldsets = (
     (None,{
         'classes': ('wide',),'fields': ('email','password1','password2')}
     ),)
   search_fields = ('email',)
   ordering = ('email',)
   filter_horizontal = ()

// Now register the new UserAdmin...
admin.site.register(MyUser,MyUserAdmin)
// ... and,since we're not using Django's builtin permissions,// unregister the Group model from admin.
admin.site.unregister(Group)

我从django教程(https://docs.djangoproject.com/en/dev/topics/auth/customizing/#a-full-example)中按照上面的内容

现在我遇到的问题是每当我修改管理员中的任何内容时,我收到的错误信息如下所示.

(1452,’无法添加或更新子行：外键约束失败(csiop.django_admin_log,CONSTRAINT user_id_refs_id_c8665aa FOREIGN KEY(user_id)REFERENCES auth_user(id))’)

因此,看起来django_admin_log表总是需要对auth_user模型的外键引用.但是因为我创建了一个客户用户模型,当我创建一个超级用户时,用户详细信息只存储在客户MyUser表中,并且在auth_user模型中没有创建任何条目,这似乎导致了该问题.

我该如何解决这个问题？请建议.

谢谢
斯里卡特