Nope, can't get this to work either. This way, nothing works. Nothing will
display on the page this way, not the products nor the form.
I see now what you were trying to do in the 1st example, however as you
said, django templates won't allow that.
I was able to do the form in the template manually (not using a django
form), just html <input>, and
assigned the value of the quantity to the value of the form element and
this works ok.
It seems there would be an easier way to do something so simple. Anyways,
thanks for all the help,
it is appreciated.
On Sun, May 15, 2016 at 1:55 AM, Stephen J. Butler <stephen.but...@gmail.com
> wrote:
> It's now a dict, so you have to index into it. The for loop won't
> magically know which element of add_product_forms you want. You'd want
> add_product_forms[item.pk].
>
> But ugg... apparently Django templates won't (out of the box) let you
> index a dict using another variable. Thanks for reminding me why I switched
> to Jinja.
>
> Change it to this:
>
> def show_cart(request):
> cart_id = _cart_id(request)
> cart_items = CartItem.objects.filter(cart_id=cart_id)
> objects = []
> for item in cart_items:
> q = item.quantity
> print q #shows correct value (quantity) of each item in cart
> add_product_form = ProductAddToCartForm(initial={'quantity': q})
> objects.append({item: item, form: add_product_form})
> context = {'objects': objects}
> return render(request, 'cart_id/cart.html', context)
>
> Then in your template, loop over "objects" instead of "cart_items":
>
> {% for obj in objects %}
> {{ obj.item.total }}
> {{ obj.form.quantity }}
>
> etc. See what's going on? Each item needs its own form.
>
> On Sun, May 15, 2016 at 12:31 AM, Chris Kavanagh <cka...@gmail.com> wrote:
>
>> Thank for the answer, Stephen. However, I'm still a little confused, and
>> it apparently doesn't' work unless I'm doing something wrong in the
>> template.
>> In the template, I'm supposed to change the "add_product_form" to
>> "add_product_forms" in the template?
>> In other words, "add_product_forms.quantity" and
>> "add_product_forms.update"? Im missing something. . .
>>
>> On Sun, May 15, 2016 at 1:00 AM, Stephen J. Butler <
>> stephen.but...@gmail.com> wrote:
>>
>>> You assign to context every loop iteration. So at the end, only the last
>>> add_product_form constructed is ever used. Try this:
>>>
>>> def show_cart(request):
>>> cart_id = _cart_id(request)
>>> cart_items = CartItem.objects.filter(cart_id=cart_id)
>>> add_product_forms = {}
>>> for item in cart_items:
>>> q = item.quantity
>>> print q #shows correct value (quantity) of each item in cart
>>> add_product_form = ProductAddToCartForm(initial={'quantity': q})
>>> add_product_forms[item.pk] = add_product_form
>>> context = {'cart_items': cart_items, 'add_product_forms':
>>> add_product_forms}
>>> return render(request, 'cart_id/cart.html', context)
>>>
>>> Note how I moved the context assignment OUTSIDE the for loop. Then
>>> adjust your template to index into add_product_forms based on item.pk.
>>>
>>> There are lots of other ways to do this too, I just thought this was the
>>> quickest to show over email.
>>>
>>> On Sat, May 14, 2016 at 8:42 PM, Chris Kavanagh <cka...@gmail.com>
>>> wrote:
>>>
>>>>
>>>> I'm working on an online shop, and I'm having a problem in the cart,
>>>> here's a screen shot (http://pasteboard.co/Vwnv2T0.png).
>>>> I'd like the form for each item (product) to show it's current quantity
>>>> (that's already been added to the cart)
>>>> as an initial value as most ecommerce sites do.
>>>>
>>>> I've tried iterating through the items in the cart (in views.show_cart)
>>>> then adding the form,
>>>> however the form for all items in the cart shows the exact same value
>>>> (of the last item).
>>>> In other words, there's 2 items in the cart, one has a quantity of 7
>>>> and the other a quantity of 3,
>>>> but both forms show the quantity as 3.
>>>>
>>>> I can't figure out how to correct this, although I'm sure it's a
>>>> simple fix.
>>>> Thanks in advance for the help, and I hope this question is formatted
>>>> correctly?
>>>> Here's the code on github if it helps. . .
>>>> https://github.com/chriskavanagh/ecommerce/tree/master/src
>>>>
>>>> # form
>>>> PRODUCT_QUANTITY_CHOICES = [(i, str(i)) for i in range(1, 21)]
>>>> class ProductAddToCartForm(forms.Form):
>>>> quantity = forms.TypedChoiceField(choices=PRODUCT_QUANTITY_CHOICES,
>>>> coerce=int)
>>>> update =
>>>> forms.BooleanField(required=False,initial=False,widget=forms.HiddenInput(attrs={'class':
>>>> 'form-control'}))
>>>>
>>>>
>>>> # views (cart_id.views.show_cart)
>>>> def show_cart(request):
>>>> cart_id = _cart_id(request)
>>>> cart_items = CartItem.objects.filter(cart_id=cart_id)
>>>> for item in cart_items:
>>>> q = item.quantity
>>>> print q #shows correct value (quantity) of each item in cart
>>>> add_product_form = ProductAddToCartForm(initial={'quantity': q})
>>>> context = {'cart_items': cart_items, 'add_product_form':
>>>> add_product_form}
>>>> return render(request, 'cart_id/cart.html', context)
>>>>
>>>>
>>>> # template (cart.html)
>>>> {% extends 'base.html' %}
>>>> {% load staticfiles %}
>>>>
>>>> {% block title %}Shopping Cart{% endblock %}
>>>>
>>>> {% block content %} {% endblock %}
>>>>
>>>> {% block extra_content %}
>>>> <div class="container">
>>>> <div class="col-md-12">
>>>>
>>>> <h2>Cart</h2>
>>>> <caption><b>Your Shopping Cart:</b> {{ cart_items_count }}
>>>> Items In Your Cart.</caption>
>>>> <hr>
>>>>
>>>> {% for item in cart_items %}
>>>>
>>>> <table class="table table-striped">
>>>> <thead>
>>>> <tr>
>>>> <th>Product</th>
>>>> <th>Unit Price</th>
>>>> <th>Quantity</th>
>>>> <th>Total Price</th>
>>>> </tr>
>>>> </thead>
>>>> <tbody>
>>>> <tr>
>>>> <td><a href="{{ item.product.get_absolute_url
>>>> }}">{{ item.product }}</a></td>
>>>> <td>${{ item.product.price }}</td>
>>>> <td>{{ item.quantity }}</td>
>>>> <td>{{ item.total }}</td>
>>>> <td>
>>>> <div class="form-group">
>>>> <form action="{% url 'cart:add'
>>>> item.product.slug %}" method="POST">
>>>> {% csrf_token %}
>>>> <div class="col-xs-3">
>>>> {{ add_product_form.quantity }}
>>>> </div>
>>>> {{ add_product_form.update
>>>> }}
>>>> <input class='btn btn-success btn-sm'
>>>> type='submit' value='Update'/>
>>>> </form>
>>>> </div>
>>>> </td>
>>>> </tr>
>>>> </tbody>
>>>> </table>
>>>>
>>>> {% empty %}
>>>> <h3>You Have Nothing In Your Cart.</h3>
>>>> {% endfor %}
>>>> </div>
>>>> </div>
>>>>
>>>> {% endblock %}
>>>>
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