In your example,
self.fields[str(key)]=forms.CharField(initial=c[key])
isn't doing what you expect.
You are setting the initial attribute of a field, not creating
a BoundField. See django/newforms/forms.py, and look at the
comments for BaseForm and Form and the code for
BoundField.
On Oct 6, 8:31 am, pinco <[EMAIL PROTECTED]> wrote:
> 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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