widgets.py

from django import forms
from django_countries import countries


class KeepOwnAttrsWidget(forms.Widget):
    def get_context(self, name, value, attrs):
        attrs.update(self.attrs)
        return super().get_context(name, value, attrs)


class CountrySelectWithChoices(KeepOwnAttrsWidget, forms.Select):
    is_required = True

    def __init__(self, *args, **kwargs):
        kwargs["choices"] = countries
        super().__init__(*args, **kwargs)


class KeepAttrsTextInput(KeepOwnAttrsWidget, forms.TextInput):
    pass


def classify(field):
    return field.replace("_", "")


def display(field):
    return field.replace("_", " ").title()


class NestedMultiWidget(KeepOwnAttrsWidget, forms.MultiWidget):
    template_name = "addressfield/widgets/nested_with_label.html"

    def __init__(self, *args, **kwargs):
        widgets = [
            widget(
                attrs={
                    "class": classify(field),
                    "required": False,
                    "display": display(field),
                }
            )
            for field, widget in self.components.items()
        ]
        super().__init__(widgets, *args, **kwargs)

    @property
    def field_names(self):
        return [classify(field) for field in self.components.keys()]

    def decompress(self, value):
        if value:
            decompressed = []
            for i, widget in enumerate(self.widgets):
                if hasattr(widget, "components"):
                    decompressed.append(widget.decompress(value))
                else:
                    decompressed.append(value.get(self.field_names[i]))
            return decompressed
        return [None] * len(self.components)

    def value_from_datadict(self, data, files, name):
        value = {}
        for i, widget in enumerate(self.widgets):
            widget_value = widget.value_from_datadict(data, files, name + "_%s" % i)
            # flatten the data structure to a single dict
            if hasattr(widget, "widgets"):
                value.update(widget_value)
            else:
                value[self.field_names[i]] = widget_value
        return value


class LocalityWidget(NestedMultiWidget):
    components = {
        "locality_name": KeepAttrsTextInput,
        "administrative_area": KeepAttrsTextInput,
        "postal_code": KeepAttrsTextInput,
    }


class AddressWidget(NestedMultiWidget):
    components = {
        "country": CountrySelectWithChoices,
        "thoroughfare": KeepAttrsTextInput,
        "premise": KeepAttrsTextInput,
        "locality": LocalityWidget,
    }

    class Media:
        js = (
            "jquery.addressfield.min.js",
            "address_form.js",
        )

    def __init__(self, *args, **kwargs):
        attrs = kwargs.get("attrs", {})
        attrs["class"] = "address"
        kwargs["attrs"] = attrs
        super().__init__(*args, **kwargs)