Sometimes we need to setup different initial data when user create new records in Django Admin.
Well, when you came at this page, I believe you already search through a lot of web pages and doesn’t see the solution, isn’t ? 😀
For instance, I have Order Model like this :
1 2 3 4 5 6 7 8 9 | class OrderInfo(CommonInfo): """Order to pay subscription""" amount = models.DecimalField(max_digits=10,decimal_places=2, default=SUBSCRIBE_AMOUNT) currency = models.ForeignKey(Currency, related_name="%(class)s_currency") payment_status = models.ForeignKey( PaymentStatus, related_name="%s(class)s_payment_status" ) |
And here is admin.py :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | class OrderAdmin(admin.ModelAdmin): list_display = [‘id’, ‘amount’, ‘currency’, ‘payment_status’] def get_object(self, request, object_id): obj = super(OrderAdmin, self).get_object(request, object_id) if obj is not None: obj.amount = Decimal("0") return obj def formfield_for_foreignkey(self, db_field, request, **kwargs): if db_field.name == ‘currency’: kwargs["queryset"] = Currency.objects.get(code="USD") return super(OrderAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs) |
You will see there are two kinds of function here :
1. get_object(self, request, object_id)
This function used for set initial value for non-foreignKey fields.
2.formfield_for_foreignkey(self, db_field, request, **kwargs)
This function used for set initial value for ForeignKey fields.
Easy right? 😀