从众所周知的User(AbstractUser)类的email字段中，我得到了一个小错误：IntegrityError: (1048, "Column 'username' cannot be null")。
当我在
CustomerBaseForm(forms.Form) class :
def clean_email(self):
email = self.form.cleaned_data.get('email')
qs = User.objects.filter(email=email)
if self.form.instance not in (None, ''):
# This is from the update form, so we exclude the updated customer
# from the search results
qs = qs.exclude(pk=self.form.instance.pk)
if qs.count():
raise ValidationError(
_('This email is already in use')
)
如何修复此方法以使其正常工作？如果问题中遗漏了某些内容，请告诉我。
编辑：
以下是该错误的回溯：
Traceback (most recent call last):
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/contrib/staticfiles/handlers.py", line 63, in __call__
return self.application(environ, start_response)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 170, in __call__
response = self.get_response(request)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 124, in get_response
response = self._middleware_chain(request)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
response = response_for_exception(request, exc)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/exception.py", line 86, in response_for_exception
response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/exception.py", line 128, in handle_uncaught_exception
return debug.technical_500_response(request, *exc_info)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django_extensions/management/technical_response.py", line 6, in null_technical_500_response
six.reraise(exc_type, exc_value, tb)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
response = get_response(request)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
response = self._get_response(request)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view
return view_func(request, *args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/utils/decorators.py", line 67, in _wrapper
return bound_func(*args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view
return view_func(request, *args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/utils/decorators.py", line 63, in bound_func
return func.__get__(self, type(self))(*args2, **kwargs2)
File "/home/jeremie/Projects/24-django/loanwolf/core/views/mixins.py", line 84, in dispatch
return super(StaffRestrictedMixin, self).dispatch(request, *args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/views/generic/base.py", line 88, in dispatch
return handler(request, *args, **kwargs)
File "/home/jeremie/Projects/24-django/loanwolf/core/views/generic.py", line 315, in post
return super(FrontendMixedFormView, self).post(request, *args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/views/generic/edit.py", line 183, in post
return self.form_valid(form)
File "/home/jeremie/Projects/24-django/loanwolf/customers/views.py", line 158, in form_valid
self.customer.save()
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/contrib/auth/base_user.py", line 80, in save
super(AbstractBaseUser, self).save(*args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/base.py", line 796, in save
force_update=force_update, update_fields=update_fields)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/base.py", line 824, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/base.py", line 908, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/base.py", line 947, in _do_insert
using=using, raw=raw)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/query.py", line 1045, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 1054, in execute_sql
cursor.execute(sql, params)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/debug_toolbar/panels/sql/tracking.py", line 165, in execute
return self._record(self.cursor.execute, sql, params)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/debug_toolbar/panels/sql/tracking.py", line 107, in _record
return method(sql, params)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/backends/utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 115, in execute
six.reraise(utils.IntegrityError, utils.IntegrityError(*tuple(e.args)), sys.exc_info()[2])
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 110, in execute
return self.cursor.execute(query, args)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/MySQLdb/cursors.py", line 205, in execute
self.errorhandler(self, exc, value)
File "/home/jeremie/Projects/24-django/venv/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
IntegrityError: (1048, "Column 'username' cannot be null")
与此回溯有关，我得到了：
def form_valid(self, form):
g = form.cleaned_data.get
self.customer = User(**{
'first_name': g('first_name'),
'last_name': g('last_name'),
'username': g('email'),
'email': g('email'),
})
# Saving the user now will trigger the signal to create his user &
# customer profile
self.customer.save()
您忘记在clean_email方法末尾返回值。这意味着form.cleaned_data.get('email')在form_valid方法中返回None，并且当您尝试在数据库中保存username=None时，您会得到一个IntegrityError。
好吧，错误很明显，您正在尝试保存我所理解的 User 对象，但您没有指定用户名，因此它会引发错误。
从用户那里获取用户名。