(Django - Python) Problems with timedelta saving form

Question

I have a problem with my auction site because when I publish an auction the function doesn't save my variable correctly, these are my codes:

• views.py

  import datetime
  from datetime import timedelta
  
  def publishAuction(request):
  
    user=request.user
  
    form = auctionForm(request.POST, request.FILES)
  
    if request.method=="POST":
  
        if form.is_valid():
  
            auction=form.save(commit=False)
            auction.advertiser=user
            auction.startDate=datetime.datetime.now()
            auction.endDate=auction.startDate+timedelta(days=1)
            auction.endPrice=request.POST.get("startPrice")
            auction.save()
            return redirect("../")
  
        else:
  
            form=auctionForm() 
  

• models.py

  class Auction(models.Model):
  
    advertiser = models.ForeignKey(User, on_delete=models.CASCADE, related_name='auction_advertiser', null=True)
    winner = models.ForeignKey(User, on_delete=models.CASCADE, related_name='auction_winner', null=True)
    title = models.CharField(max_length=30)
    text = models.TextField()
    startPrice = models.FloatField(null=True)
    endPrice = models.FloatField()
    status = models.BooleanField(default=True)
    image = models.ImageField(upload_to='images/')
    startDate = models.DateTimeField(auto_now=False, auto_now_add=True)
    endDate = models.DateTimeField(auto_now=False, auto_now_add=True)
  

The publication is done correctly, everything except endDate that is always equal to startDate...

I have tried also with datetime.datetime.now instead of auction.startDate or datetime.timedelta(days=1) but when I get the value in the shell is always the same...

In the scratch.py file I write the same codes and it works, I don't know why doesn't work in the function... :S

Thanks to everyone!

question from:https://stackoverflow.com/questions/65833653/django-python-problems-with-timedelta-saving-form

Answer 1

You have defined auto_now_add=True on your endDate field, which renders field uneditable and set as now(). From documentation:

Automatically set the field to now when the object is first created. Useful for creation of timestamps. Note that the current date is always used; it’s not just a default value that you can override. So even if you set a value for this field when creating the object, it will be ignored.