Invoice with Items and Payment Terms Example

In this example you can see how to apply it to a view that has more than one inline formset.

# Forms
class PaymentTermForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = ModalEditFormHelper()
        self.helper.layout = ModalEditLayout(
            "due_date",
            "amount",
        )

    class Meta:
        model = PaymentTerm
        fields = "__all__"

class InvoiceForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.layout = Layout(
            Row(Column("invoice_number"), Column("date")),
            "client",
            Fieldset(
                "Items",
                ModalEditFormsetLayout(
                    "InvoiceItemInline",
                    list_display=["description", "quantity", "unit_price"],
                ),
            ),
            Fieldset(
                "Payment Terms",
                ModalEditFormsetLayout(
                    "PaymentTermInline",
                    list_display=["due_date", "amount"],
                ),
            ),
            Submit("submit", "Save", css_class="btn btn-primary"),
        )

    class Meta:
        model = Invoice
        fields = "__all__"

# Inline Formset
class PaymentTermInline(InlineFormSetFactory):
    model = PaymentTerm
    form_class = PaymentTermForm
    fields = ["due_date", "amount"]
    factory_kwargs = {"extra": 0}


# View
class CreateInvoiceView(CreateWithInlinesView):
    model = Invoice
    inlines = [InvoiceItemInline, PaymentTermInline]
    form_class = InvoiceForm

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