satchless model example

forms.py

from satchless.forms.widgets import DecimalInput
from satchless.product.forms import BaseVariantForm
from . import models

class ProductPriceForm(forms.ModelForm):
    class Meta:
        widgets = {
            'price': DecimalInput(min_decimal_places=2),
        }

class ShoeVariantForm(BaseVariantForm):
    def __init__(self, *args, **kwargs):
        super(ShoeVariantForm, self).__init__(*args, **kwargs):
            self.fields['color'].choices = 
            [
                (k,v) for k,v in models.ShoeVariant.COLOR_CHOICES if k in
                self.product.variants.values_list('color', flat=True).distinct()
                ]

    color = forms.CharField(
            max_length=10,
            widget=forms.Select(choices=models.ShoeVariant.COLOR_CHOICES))
    size = forms.CharField(
            max_length=6,
            widget=forms.Select(choices=models.ShoeVariant.SIZE_CHOICES))
    def _get_variant_queryset(self):
        return models.ShoeVariant.objects.filter(
                product=self.product,
                color=self.cleaned_data['color'],
                size=self.cleaned_data['size'],
            )
    def clean(self):
        if not self._get_variant_queryset().exists():
            raise forms.ValidationError("Variant does not exist")
        return self.cleaned_data

    def get_variant(self):
        return self._get_variant_queryset().get()