Django/python: (1048, "Column 'date' cannot be null") - django

Question

I have created a Django project in which type-1 users can create a Post and type-2 users can bid on a post out of post_queryset = Post.objects.filter(accepted=False). Finally, post_owner can accept a bid. After accepting I wanted to remove the accepted_object from post_queryset. So, I created a view(accept_bid) in which a type-1 user can accept a bid and simultaneously it passes a BooleanField(accepted) = True. With this, the post will no longer appear in the post_list page. But when I saving the accept_bid instance, it raising an IntegrityError: (1048, "Column 'date' cannot be null"). I'm not sure whether my approach in changing the BooleanField() = True in my view is correct. I would appreciate helping me solve this.
Here's My code:
Models.py:
class Post(models.Model):
item = models.CharField(max_length=20)
post_owner = models.OneToOneField(settings.AUTH_USER_MODEL, default=1)
date = models.DateField()
accepted = models.BooleanField(default = False)
class Bid(models.Model):
post = models.ForeignKey(Post, related_name = bids)
amount = models.IntegerField(max_length = 20)
bidder = models.ForeingKey(settings.AUTH_USER_MODEL)
class Auction(models.Model):
post = models.OneToOneField(Post)
post_owner = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, blank=True)
bid = models.OneToOneField('truck.Bid', related_name='auctions')
forms.py:
class AcceptedForm(forms.ModelForm):
accepted = forms.BooleanField(required=False)
class Meta:
model = Post
fields = ('accepted', )
views.py:
def accept_bid(request, post_id, bid_id):
post = get_object_or_404(Post, id=post_id)
bid = get_object_or_404(Bid, id=bid_id)
if request.method=='POST':
form = AuctionForm(request.POST or None)
form1 = AcceptedForm(request.POST)
if form.is_valid() and form1.is_valid():
accept_bid = form.save(commit=False)
accept_bid.bid = bid
accept_bid.post = post
accept_bid.post_owner = request.user
accepted = form1.save()
accepted.accepted = True
accept_bid.save()
form.save()
form1.save()
else:
form = AuctionForm()
form1 = AcceptedForm()
context = {
"bid_id" : bid_id,
"post_id" : post_id,
"bid": bid,
"post":post,
'form': form
'form1': form1,
}
return render(request, 'loggedin_load/active_deals.html', context)
TraceBack:
Traceback:
File "c:\python34\lib\site-packages\django\db\backends\mysql\base.py" in execute
112. return self.cursor.execute(query, args)
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in execute
226. self.errorhandler(self, exc, value)
File "c:\python34\lib\site-packages\MySQLdb\connections.py" in defaulterrorhandler
36. raise errorvalue
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in execute
217. res = self._query(query)
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in _query
378. rowcount = self._do_query(q)
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in _do_query
341. db.query(q)
File "c:\python34\lib\site-packages\MySQLdb\connections.py" in query
280. _mysql.connection.query(self, query)
During handling of the above exception ((1048, "Column 'date' cannot be null")), another exception occurred:
File "c:\python34\lib\site-packages\django\core\handlers\base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "c:\python34\lib\site-packages\django\core\handlers\base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "c:\python34\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
23. return view_func(request, *args, **kwargs)
File "c:\python34\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
23. return view_func(request, *args, **kwargs)
File "C:\Users\sumanth\Desktop\django-custom-user-master\search field\Project\mysite\personal\views.py" in accept_bid
447. accepted = form1.save()
File "c:\python34\lib\site-packages\django\forms\models.py" in save
451. self.instance.save()
File "c:\python34\lib\site-packages\django\db\models\base.py" in save
708. force_update=force_update, update_fields=update_fields)
File "c:\python34\lib\site-packages\django\db\models\base.py" in save_base
736. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "c:\python34\lib\site-packages\django\db\models\base.py" in _save_table
820. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "c:\python34\lib\site-packages\django\db\models\base.py" in _do_insert
859. using=using, raw=raw)
File "c:\python34\lib\site-packages\django\db\models\manager.py" in manager_method
122. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "c:\python34\lib\site-packages\django\db\models\query.py" in _insert
1039. return query.get_compiler(using=using).execute_sql(return_id)
File "c:\python34\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
1060. cursor.execute(sql, params)
File "c:\python34\lib\site-packages\django\db\backends\utils.py" in execute
79. return super(CursorDebugWrapper, self).execute(sql, params)
File "c:\python34\lib\site-packages\django\db\backends\utils.py" in execute
64. return self.cursor.execute(sql, params)
File "c:\python34\lib\site-packages\django\db\backends\mysql\base.py" in execute
117. six.reraise(utils.IntegrityError, utils.IntegrityError(*tuple(e.args)), sys.exc_info()[2])
File "c:\python34\lib\site-packages\django\utils\six.py" in reraise
685. raise value.with_traceback(tb)
File "c:\python34\lib\site-packages\django\db\backends\mysql\base.py" in execute
112. return self.cursor.execute(query, args)
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in execute
226. self.errorhandler(self, exc, value)
File "c:\python34\lib\site-packages\MySQLdb\connections.py" in defaulterrorhandler
36. raise errorvalue
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in execute
217. res = self._query(query)
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in _query
378. rowcount = self._do_query(q)
File "c:\python34\lib\site-packages\MySQLdb\cursors.py" in _do_query
341. db.query(q)
File "c:\python34\lib\site-packages\MySQLdb\connections.py" in query
280. _mysql.connection.query(self, query)
Exception Type: IntegrityError at /post/3/bid/7/
Exception Value: (1048, "Column 'date' cannot be null")

Answer 1

The error trips when you try to save form1 rather than when saving the accept_bid instance:
File "C:\Users\sumanth\Desktop\django-custom-user-master\search field\Project\mysite\personal\views.py" in accept_bid
447. accepted = form1.save()
form1 is a ModelForm based on your Post model. Since your Post model already has an accepted attribute, you don't have to manually define a field for it like you did here - including that field in the Meta definition for the form like you've done is enough.
You will need to do one of three things from there:
Also include the date field in your ModelForm so that it can be set by the submitter,
Set up your model to either automatically include a date on creation (auto_now_add=True), or to allow that field to be blank. Or,
Use commit=False to interrupt the save and add a date to your object:
accepted = form1.save(commit=False)
accepted.date = ...
accepted.save()
Also note that here:
accepted = form1.save()
accepted.accepted = True
You save accepted to your database, then update the object locally. The second line is only updating the object in memory, not the database. If you print accepted.accepted it will indeed show up as True, but if you re-fetch the object from the database and then try it again it'll show up as False since that change was never saved to the DB.