StackedPolymorphicInline broken in admin, they are rendered but dynamic behavior not present.

[marcosalcazar]

Hello!

I need your help with something, not sure if this is a bug or an error on my side.

I've configured admin as explained here https://django-polymorphic.readthedocs.io/en/stable/admin.html#inline-models
It was working, until something broke it recently (I suspect something in the browser? I'm pretty sure it was working ok)

Now the inlines are rendered, but no polymorphic inline support is applied. Also this error appears in google chrome console

What do you think? Is this a bug?

Here is my code, simplified.

#################### models.py ####################
class WaysToSaveBaseItem(PolymorphicModel):
    product_name = models.CharField(max_length=60)


class WaysToSaveProductLayoutA(WaysToSaveBaseItem):
    pass


class WaysToSaveProductLayoutB(WaysToSaveBaseItem):
    eyebrow_text = models.CharField(max_length=25)


class WaysToSaveCoupon(WaysToSaveBaseItem):
    red_promotion_text = models.CharField(max_length=10)


#################### admin.py ####################
class WaysToSaveProductLayoutAInline(StackedPolymorphicInline.Child):
    model = WaysToSaveProductLayoutA


class WaysToSaveProductLayoutBInline(StackedPolymorphicInline.Child):
    model = WaysToSaveProductLayoutB


class WaysToSaveCouponInline(StackedPolymorphicInline.Child):
    model = WaysToSaveCoupon


class WaysToSaveItemForLayoutInline(StackedPolymorphicInline):
    model = WaysToSaveBaseItem


class WaysToSaveItemForLayoutAInline(WaysToSaveItemForLayoutInline):
    child_inlines = (
        WaysToSaveProductLayoutAInline,
        WaysToSaveCouponInline,
    )


class WaysToSaveItemForLayoutBInline(WaysToSaveItemForLayoutInline):
    child_inlines = (
        WaysToSaveProductLayoutBInline,
        WaysToSaveCouponInline,
    )


@admin.register(WaysToSaveSection)
class WaysToSaveSectionAdmin(PolymorphicInlineSupportMixin, admin.ModelAdmin):
    inlines = (
        WaysToSaveItemForLayoutAInline,
    )

[marcosalcazar]

Removing def get_min_num(self, request, obj=None, **kwargs): fixed the issue. Console errors are still there but they are not the source of this problem.