Hi,
I'm trying to figure out how to build a form to display x fields,
where x is determined at runtime (e.g. a form to update the quantities
of all the items in a shopping cart).
My model is:
class CartForm(forms.Form):
def __init__(self, c, *args, **kwargs):
super(CartForm, self).__init__(*args, **kwargs)
# c is a dictionary containing cart items
for key in c.keys():
self.fields[str(key)]=forms.CharField(initial=c[key])
return
My view is:
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 = CartForm(c=create_cart_dictionary(cart_items))
return render_to_response('show_cart3.html', {'cart': cart,
'num_items': cart.no_items, 'cart_items': cart_items, 'form':form})
def update_quantity(request):
if request.method == 'POST':
cart = Cart.objects.get(pk=request.session.get('cart_id', None))
form = CartForm(request.POST)
#old_quantity =item.quantity
if form.is_valid():
for item in cart.cartitem_set.all():
itemid = item.id
new_quantity = form.cleaned_data['cart_item' +
str(itemid)]
... save the new quantities
Create_cart_dictionary is a function that create a dictionary like
{'item_id': item}.
show_cart() works as expected, since it displays a dynamically
generated form with fields named by the item.id displayed.
update_quantity() do not works, since form.is_valid() is always false:
>>> form = CartForm({'a': 10, 'b':20})
>>> form
<sensfly.carts.models.CartForm object at 0x13bce70>
>>> form.is_valid()
False
>>> form = CartForm({'a': '10', 'b':'20'})
>>> form.is_valid()
False
>>> print form
<tr><th><label for="id_a">A:</label></th><td><input type="text"
name="a" value="10" id="id_a" /></td></tr>
<tr><th><label for="id_b">B:</label></th><td><input type="text"
name="b" value="20" id="id_b" /></td></tr>
>>> form.is_bound
False
The problems seems to be that the form is not bound.
What I'm doing wrong? How to bound and validate the dynamically
generated form?
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