Dynamic form validation

Hi,

I have the following models for each item in my shopping
cart:

class CartItem(models.Model):
	option = models.ForeignKey(Option) #product option tied to
a
particular product
	cart = models.ForeignKey(Cart) #contains all cart items
	quantity = models.IntegerField(blank=True, null=True)
	unit_price = models.FloatField(blank=True, null=True)

	def __unicode__(self):
		return (self.option.full_name + "=>" +
str(self.quantity))


I'm trying to figure out how a clean way to build a form
with newform
library to permit a user to modify quantities of each
CartItem
instance in the shopping cart.


As a matter of fact, I don't know how many items are in the
shopping
cart, so I tryed to do like this:


class FormForItemQuantity(forms.Form):

	def __init__(self, cart_items, *args, **kwargs):
		super(FormForItemQuantity, self).__init__(*args,
**kwargs)
		for item in cart_items:
			self.fields[str(item.id)]=forms.IntegerField(initial=item
.quantity)
		return

My view is therefore something like this:

def show_cart(request):
	cart = Cart.objects.get(pk=request.session.get('cart_id',
None))
	cart_items = cart.cartitem_set.all() #Just to avoid two
hits for the
same info
	form_set = FormForItemQuantity(cart_items)
	cart_rows = zip(cart_items, form_set)
	return render_to_response('show_cart3.html', {'cart':
cart,
'num_items': cart.no_items, 'cart_items': cart_items,
'form_set':form_set, 'cart_rows':cart_rows})


and show_cart3 template is:

<h3>Your Cart</h3>
	<table>
		<tr>
			<td>Prodotto</td>
			<td>Variante</td>
			<td>Quantità</td>
			<td>Azione</td>
		</tr>
		<form method="POST"
action="/carts/update_quantity/">
			 {% for item,form in cart_rows %}
			<tr>
				<td>{{item.option.product.full_name}}</td>
				<td>{{item.option.full_name}}</td>
				<td>{}</td>
				<td><a
href="/carts/{{item.id}}/delete">Remove</a&g
t;</td>
			</tr>
			 {% endfor %}
		</table>
		<input type="SUBMIT" value="Aggiorna
quantit&agrave;"/>
	</form> Numero items: {}
	<a href="/carts/empty">Empty the
cart</a> <br/> <a href="/orders/
save">Save the order</a>

The form is displayed as I wanted. However, I'm not able to
clean
posted data.

How can I access the form and extract the quantity data
posted from
the user?

I tried to something like:

quantity_form = FormForItemQuantity(request.POST)

but it isn't working.


Thank you for any help.


--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the
Google Groups "Django users" group.
To post to this group, send email to django-usersgooglegroups.com
To unsubscribe from this group, send email to
django-users-unsubscribegooglegroups.com
For more options, visit this group at htt
p://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---