IntegrityError question_question.pub_date可能不是NULL

Question

幫助，我不明白髮生了什麼事情。試圖刪除數據庫，仍然得到這個錯誤。看看代碼並告訴我我錯在哪裏。謝謝。

models.py

class Question(models.Model): 
    title = models.CharField(max_length=120) 
    content = models.TextField() 
    pub_date = models.DateTimeField(blank=True, null=False) 
    author = models.ForeignKey(User) 
    views = models.IntegerField(default=0) 
    slug = models.SlugField(max_length=240, blank=True) 
    tag = TaggableManager() 

    def __unicode__(self): 
    return self.title 

def save(self, **kwargs): 
    if not self.pk: 
     self.date_added = date.today() 

    if self.title and not self.slug: 
     self.slug = slugify(self.title) 

    super(Question, self).save(**kwargs) 

views.py的一部分

def ask(request): 
if request.method == 'POST': 
    form = AskForm(request.POST) 
    if form.is_valid(): 
     question = form.save(commit=False) 
     question.author = request.user 
     question.save() 

     return redirect('/question/one_question') + str(question.id) 
return HttpResponseBadRequest() 

forms.py

class AskForm(forms.ModelForm): 
tag = forms.CharField(max_length=100, required=False, label='Tags:', 
         help_text="Write here some tags, example: python, django ") 

class Meta: 
    model = Question 
    fields = ['title', 'content'] 
    labels = { 
     'title': 'Title', 'content': 'Text of your question' 
    } 

回溯

Environment: 


Request Method: POST 
Request URL: http://127.0.0.1:8000/question/ask/ 

Django Version: 1.6.5 
Python Version: 2.7.3 
Installed Applications: 
('django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.sites', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'django.contrib.admin', 
'question', 
'south', 
'taggit', 
'hitcount') 
Installed Middleware: 
('django.middleware.common.CommonMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware', 
'django.middleware.cache.FetchFromCacheMiddleware') 


Traceback: 
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response 
    112.      response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "/home/karmadorje/QandA/question/views.py" in ask 
    29.    question.save() 
File "/home/karmadorje/QandA/question/models.py" in save 
    28.   super(Question, self).save(**kwargs) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save 
    545.      force_update=force_update, update_fields=update_fields) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save_base 
    573.    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in _save_table 
    654.    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in _do_insert 
    687.        using=using, raw=raw) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py" in _insert 
    232.   return insert_query(self.model, objs, fields, **kwargs) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in insert_query 
    1514.  return query.get_compiler(using=using).execute_sql(return_id) 
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py" in execute_sql 
    903.    cursor.execute(sql, params) 
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py" in execute 
    69.    return super(CursorDebugWrapper, self).execute(sql, params) 
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py" in execute 
    53.     return self.cursor.execute(sql, params) 
File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py" in __exit__ 
    99.     six.reraise(dj_exc_type, dj_exc_value, traceback) 
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py" in execute 
    53.     return self.cursor.execute(sql, params) 
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/sqlite3/base.py" in execute 
    451.   return Database.Cursor.execute(self, query, params) 

Exception Type: IntegrityError at /question/ask/ 
Exception Value: question_question.pub_date may not be NULL 

Answer 1

在問題類，你說，pub_date不能爲空：

pub_date = models.DateTimeField(blank=True, null=False) 

當你保存的問題，你有沒有設定一個PUB_DATE：

question = form.save(commit=False) 
question.author = request.user 
question.save() 

嘗試保存之前設置question.pub_date。