Wrong detail url in polymorphic models

[mmzeynalli]

Checklist

• The bug is reproducible against the latest release or master.
• There are no similar issues or pull requests to fix it yet.

Describe the bug

I have polymorphic models, and when I click "view" or "edit" its base url is changed, resulting in 404.

Steps to reproduce the bug

from sqlalchemy.orm import DeclarativeBase

class PinnedObject(DeclarativeBase):
    __tablename__ = 'core_pinnedobject'
    id: Mapped[intpk]
    pinnedable_type: Mapped[str] = mapped_column(String)
    pinnedable_id: Mapped[int]

    __mapper_args__ = {
        'polymorphic_identity': __tablename__,
        'polymorphic_on': pinnedable_type,
    }

class NewsPinned(PinnedObject):
    __mapper_args__ = {
        'polymorphic_identity': 'news_pinned',
    }


class VacancyPinned(PinnedObject):
    __mapper_args__ = {
        'polymorphic_identity': 'vacancy_pinned',
    }

and when I create admin class for PinnedObject:

class PinnedObjectAdmin(ModelView, model=PinnedObject):  # type: ignore[call-arg]
    def _build_url_for(self, name, request, obj):
        # Need this bcuz of polymorphism: object can be NewsPinned or VacancyPinned
        # resulting in different generated URLs
        return request.url_for(
            name,
            identity=slugify_class_name(PinnedObject.__name__),  # the original is `slugify_class_name(obj.__class__.__name__)`
            pk=get_object_identifier(obj),
        )

Expected behavior

In the list view, the base url is pinned-object/list. When I click to one item it should beCCC

Actual behavior

However, link changes to news-pinned/edit/{id} or vacancy-pinned/edit/{id} resulting to 404 page. I had to overwrite _build_url_for function, to force class name to PinnedObject. I believe, instead of obj.__class__.__name__ it should take model of the AdminView.

Debugging material

No response

Environment

• OS: Windows
• Python: 3.11
• SQLAdmin: 0.20.1

Additional context

No response