[英]Django 2.0 Integrity error Not NULL constraint failed
I am trying to display the notes' contents which are accepted from a logged in user through a NotesCreateForm. 我试图显示便笺的内容,这些内容已通过NotesCreateForm从登录用户接受。 The Form is displayed properly but when I click submit, instead of displaying DetailView, it gives below error.
窗体显示正确,但是当我单击提交时,而不是显示DetailView,它给出了以下错误。 I am new to Django so please help!
我是Django的新手,请帮助! Also please suggest if CBV is proper here or it should be changed to FBV?
另外,请在这里建议CBV是否正确,还是应将其更改为FBV?
Views.py Views.py
class NotesCreateView(LoginRequiredMixin,CreateView):
model=Notes
form_class=NotesCreateForm
redirect_field_name='notes_detail.html'
class NotesListView(ListView):
model=Notes
class NotesDetailView(LoginRequiredMixin,DetailView):
model=Notes
Models.py 型号
class Notes(models.Model):
user=models.ForeignKey(User,on_delete=models.CASCADE)
title=models.CharField(max_length=255)
subject=models.CharField(max_length=255)
text=models.TextField()
def get_absolute_url(self):
return reverse('notes_detail',kwargs={'pk':self.pk})
Forms.py Forms.py
class NotesCreateForm(forms.ModelForm):
class Meta:
model=Notes
fields=('title','subject','text')
Urls.py Urls.py
from django.contrib import admin
from django.urls import path
from django.conf.urls import url
from EnoteApp import views
from django.contrib.auth import views as auth_views
urlpatterns = [
path('admin/', admin.site.urls),
url(r'^login/$', auth_views.login, name='login'),
url(r'^logout/$', auth_views.logout, name='logout'),
url(r'^signup/$',views.signup,name='signup'),
url(r'^$',views.HomeView.as_view(),name='home'),
url(r'^about/$',views.AboutView.as_view(),name='about'),
url(r'^notes/list/$',views.NotesListView.as_view(),name='notes_list'),
url(r'^notes/create/$',views.NotesCreateView.as_view(),name='notes_create'),
url(r'^notes/(?P<pk>\d+)/$',views.NotesDetailView.as_view(),name='notes_detail'),
]
Error 错误
Internal Server Error: /notes/create/
Traceback (most recent call last):
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\sqlite3\base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.IntegrityError: NOT NULL constraint failed: EnoteApp_notes.user_id
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\core\handlers\exception.py", line 35, in inner
response = get_response(request)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\core\handlers\base.py", line 128, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\views\generic\base.py", line 69, in view
return self.dispatch(request, *args, **kwargs)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\contrib\auth\mixins.py", line 52, in dispatch
return super().dispatch(request, *args, **kwargs)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\views\generic\base.py", line 89, in dispatch
return handler(request, *args, **kwargs)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\views\generic\edit.py", line 172, in post
return super().post(request, *args, **kwargs)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\views\generic\edit.py", line 142, in post
return self.form_valid(form)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\views\generic\edit.py", line 125, in form_valid
self.object = form.save()
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\forms\models.py", line 456, in save
self.instance.save()
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\base.py", line 729, in save
force_update=force_update, update_fields=update_fields)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\base.py", line 759, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\base.py", line 842, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\base.py", line 880, in _do_insert
using=using, raw=raw)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\query.py", line 1125, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\models\sql\compiler.py", line 1281, in execute_sql
cursor.execute(sql, params)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\utils.py", line 100, in execute
return super().execute(sql, params)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\Chan\Anaconda3\envs\myDjangoEnv\lib\site-packages\django\db\backends\sqlite3\base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: EnoteApp_notes.user_id
You are probably completing the form while the user
field is expecting a value when none is passed. 您可能在
user
字段期望不传递任何值时填写表单。 Add this to your view: 将此添加到您的视图:
class NotesCreateView(LoginRequiredMixin,CreateView):
model=Notes
form_class=NotesCreateForm
redirect_field_name='notes_detail.html'
def form_valid(self, form):
form.instance.user = self.request.user
return super(NotesCreateView, self).form_valid(form)
This will assign the Note to the current logged in user. 这会将注释分配给当前登录的用户。
In the NotesCreateView you have to specify the success_url which links the DetailView. 在NotesCreateView中,您必须指定成功的URL,该URL链接到DetailView。
change the NotesCreateView as follows 如下更改NotesCreateView
class NotesCreateView(LoginRequiredMixin,CreateView):
model=Notes
form_class=NotesCreateForm
def get_success_url(self, *args, **kwargs):
return reverse('notes_detail',kwargs={'pk':self.object.pk}
I hope this works for you. 希望这对您有用。
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