checkout/src/purchase/forms.py

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from crispy_forms.helper import FormHelper
from crispy_forms.layout import Div, Field, Layout, Submit
from django import forms
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from django.utils.translation import gettext as _
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from purchase.layout import BasketItemField
from purchase.models import Basket, Product
PREFIX = "product-"
class BasketForm(forms.ModelForm):
class Meta:
model = Basket
fields = ["payment_method"]
class Media:
js = ["purchase/js/basket_form.js"]
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.helper = FormHelper()
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self.helper.add_input(Submit("submit", _("Save")))
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self.helper.layout = Layout()
products = {}
basket = kwargs.get("instance")
if basket:
for item in basket.items.all():
products[item.product] = item.quantity
fields = []
for product in Product.objects.all():
field_name = f"{PREFIX}{product.id}"
self.fields.update(
{
field_name: forms.IntegerField(
label=product.name,
min_value=0,
initial=products.get(product, 0),
)
}
)
fields.append(BasketItemField(field_name, product=product))
self.helper.layout = Layout(
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Div(
*fields,
css_class="row row-cols-2 row-cols-sm-3 row-cols-md-4 row-cols-lg-5 row-cols-xl-6 g-4",
),
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Field("payment_method"),
)
def save(self, commit=True):
instance: Basket = super().save(commit=True)
name: str
for name, value in self.cleaned_data.items():
if name.startswith(PREFIX):
product_id = int(name.removeprefix(PREFIX))
if value > 0:
instance.items.update_or_create(
product_id=product_id, defaults={"quantity": value}
)
if value == 0:
instance.items.filter(product_id=product_id).delete()
return instance