Django: how to make POST request with form data? - django

Question

I'm learning Django and am running into an issue posting a piece of data to the database. Here's my code:
urls.py
urlpatterns = [
path("", views.index, name="index"),
...
path("listing/<int:listing_id>", views.display_listing, name="listing")
]
Models.py
class Bid(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='usr_bids')
price = models.DecimalField(max_digits=5, decimal_places=2)
class Listing(models.Model):
title = models.CharField(max_length=50)
bids = models.ManyToManyField(Bid, blank=True, related_name='bids')
price = models.DecimalField(max_digits=7, decimal_places=2)
closed = models.BooleanField(default=False)
Forms.py
class BidForm(ModelForm):
class Meta:
model = Bid
fields = ['price']
views.py
def display_listing(request, listing_id):
listing = Listing.objects.get(pk=listing_id)
if not request.user.is_authenticated:
return HttpResponseRedirect(reverse('login'))
if request.method == "POST":
user = User.objects.get(username=request.user)
if request.POST.get("button") == "Watchlist":
if not user.watchlist.filter(listing=listing):
watchlist = Watchlist()
watchlist.user = user
watchlist.listing = listing
watchlist.save()
else:
user.watchlist.filter(listing=listing).delete()
return HttpResponseRedirect(reverse('listing', args=(listing.id, )))
if not listing.closed:
if request.POST.get("button") == "Close":
listing.closed = True
listing.save()
else:
price = float(request.POST["price"])
bids = listing.bids.all()
if user.username != listing.creator.username:
if price <= listing.price:
return render(request, 'auctions/listing.html',{
'listing': listing,
'form': BidForm(),
'message': 'Increase your bid.'
})
form = BidForm(request.POST)
if form.is_valid():
bid = form.save(commit=False)
bid.user = user
bid.save()
listing.bids.add(bid)
listing.price = price
listing.save()
else:
return render(request, 'auctions/listing.html', {
'form': form
})
return HttpResponseRedirect(reverse('listing', args=(listing.id, )))
else:
return render(request, 'auctions/listing.html', {
'listing': listing,
'form': BidForm(),
'comments': listing.comments.all()
})
auction/listings.html
<div>
<form action="{% url 'listing' listing.id %}" method="POST">
{% csrf_token %}
<div class="form-group">
<label for="bid">{{ listing.bids.count }} bid(s) so far. You have the best bid!.</label>
</div>
<div class="form-group">
{{ form }}
</div>
<div class="form-group">
<input type="submit" name="button" class="btn btn-primary" value="Send Bid">
</div>
</form>
</div>
I populate a value (e.g. 300) in the price field. Then, I click the "Send Bid" button. Unfortunately, nothing happens.
Does anyone see why I'm unable to save a price to the database? Thanks in advance for taking a look!

Answer 1

At a first glance, you should rather have something like:
<form method="post">
{% csrf_token %}
{{ form }}
<input type="submit" name="button" class="btn btn-primary" value="Send Bid">
</form>
in your template.