models.py：
from django.contrib.auth.models import User
class Location(models.Model):
user = models.ForeignKey(User)
...
...
views.py：
class AddLocationPageView(CreateView):
model = Location
form_class = LocationForm
template_name = 'add_location.html'
success_url = '/add_location/location_added/'
@method_decorator(login_required)
def dispatch(self, *args, **kwargs):
return super(AddLocationPageView, self).dispatch(*args, **kwargs)
forms.py：
from multiupload.fields import MultiFileField
from .models import Location, LocationType, Equipment, VisitTime, Photo
class LocationForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(LocationForm, self).__init__(*args, **kwargs)
self.fields["types"].queryset = LocationType.objects.all()
self.fields["equipment"].queryset = Equipment.objects.all()
self.fields["visit_times"].queryset = VisitTime.objects.all()
class Meta:
model = Location
fields = ['name', 'types', 'equipment', 'visit_times', 'keywords', 'description']
widgets = {
'name': forms.TextInput(attrs={'placeholder': 'Напр. Стоунхендж'}),
'keywords': forms.TextInput(attrs={'placeholder': 'Напр. море, побережье, скалы'}),
'description': forms.Textarea(attrs={'placeholder': 'Любая информация, которую посчитаете нужной'}),
'types': forms.CheckboxSelectMultiple(),
'equipment': forms.CheckboxSelectMultiple(),
'visit_times': forms.CheckboxSelectMultiple(),
}
photos = MultiFileField(min_num=1, max_num=10)
def save(self, commit=True):
instance = super(LocationForm, self).save(commit)
for each in self.cleaned_data['photos']:
Photo.objects.create(photo=each, location=instance)
return instance
urls.py：
url(r'^add_location/$', AddLocationPageView.as_view(), name='add_location'),
当我尝试保存位置表单时，我看到错误。 为了摆脱这个麻烦，我必须做些什么？ 任何建议将非常感谢！
非常感谢！
我在下面添加了追溯以获得更清晰。
回溯：
File "C:\commercial_projects\fl\lib\site-packages\django\core\handlers\base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\views\generic\base.py" in view
71. return self.dispatch(request, *args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\utils\decorators.py" in _wrapper
34. return bound_func(*args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\utils\decorators.py" in bound_func
30. return func.__get__(self, type(self))(*args2, **kwargs2)
File "C:\commercial_projects\fl\src\findlocation_app\views.py" in dispatch
43. return super(AddLocationPageView, self).dispatch(*args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\views\generic\base.py" in dispatch
89. return handler(request, *args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\views\generic\edit.py" in post
249. return super(BaseCreateView, self).post(request, *args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\views\generic\edit.py" in post
215. return self.form_valid(form)
File "C:\commercial_projects\fl\lib\site-packages\django\views\generic\edit.py" in form_valid
193. self.object = form.save()
File "C:\commercial_projects\fl\src\findlocation_app\forms.py" in save
33. instance = super(LocationForm, self).save(commit)
File "C:\commercial_projects\fl\lib\site-packages\django\forms\models.py" in save
459. construct=False)
File "C:\commercial_projects\fl\lib\site-packages\django\forms\models.py" in save_instance
105. instance.save()
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\base.py" in save
734. force_update=force_update, update_fields=update_fields)
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\base.py" in save_base
762. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\base.py" in _save_table
846. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\base.py" in _do_insert
885. using=using, raw=raw)
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\manager.py" in manager_method
127. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\query.py" in _insert
920. return query.get_compiler(using=using).execute_sql(return_id)
File "C:\commercial_projects\fl\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
974. cursor.execute(sql, params)
File "C:\commercial_projects\fl\lib\site-packages\django\db\backends\utils.py" in execute
79. return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\commercial_projects\fl\lib\site-packages\django\db\backends\utils.py" in execute
64. return self.cursor.execute(sql, params)
File "C:\commercial_projects\fl\lib\site-packages\django\db\utils.py" in __exit__
98. six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\commercial_projects\fl\lib\site-packages\django\db\backends\utils.py" in execute
64. return self.cursor.execute(sql, params)
File "C:\commercial_projects\fl\lib\site-packages\django\db\backends\sqlite3\base.py" in execute
318. return Database.Cursor.execute(self, query, params)
Exception Type: IntegrityError at /add_location/
Exception Value: findlocation_app_location.user_id may not be NULL
答案 0 :(得分：3)
你必须先了解问题所在。您在模型中有user字段的外键，但您在表单中将其排除在外。由于user字段不能为空，因此数据库将拒绝您的保存。要为ModelForm设置外键，您应该覆盖form_valid方法：
class AddLocationPageView(CreateView):
model = Location
def form_valid(self, form):
location = form.save(commit=False)
location.user = self.request.user
return super(CreateArticle, self).form_valid(form)
您还可以在表单中加入user，这样您的表单会在您保存时包含信息，因此不会更改代码。但我打赌这不是你想要的，因为那时你的表单会显示一个下拉菜单，让你选择一个没有意义的用户。
请参阅django doc what's going on with commit=False。