Update of the linkify function for django admin that also handles ManyToManyField

linkify.py

from typing import Optional

from django.contrib import admin
from django.contrib.contenttypes.models import ContentType
from django.db.models import ManyToManyField, ForeignKey, Model
from django.urls import reverse
from django.utils.html import format_html


def create_link(linked_obj, app_label: str, label_prop: Optional[str] = None) -> str:
    linked_content_type = ContentType.objects.get_for_model(linked_obj)
    model_name = linked_content_type.model
    view_name = f"admin:{app_label}_{model_name}_change"
    link_url = reverse(view_name, args=[linked_obj.pk])
    return "<a href='%s'>%s</a>" % (link_url, getattr(linked_obj, label_prop) if label_prop else linked_obj)


def linkify(field_name: str, label_prop: Optional[str] = None, short_description: Optional[str] = None, as_html_list: bool = False):
    def _linkify(obj: Model):
        content_type = ContentType.objects.get_for_model(obj)
        app_label = content_type.app_label
        field_type = obj._meta.get_field(field_name)
        items = None

        if isinstance(field_type, ManyToManyField):
            items = list(getattr(obj, field_name).all())
        elif isinstance(field_type, ForeignKey):
            items = [getattr(obj, field_name)]
        else:
            print(f'field_name {field_name} is not ManyToManyField or ForeignKey')

        links = [create_link(itm, app_label, label_prop) for itm in items if itm is not None]

        if len(links) > 1:
            if as_html_list:
                html = "<ul>"
                for link in links:
                    html += f'<li>{link}</li>'
                html += "</ul>"
            else:
                html = ", ".join(links)
        else:
            html = links[0]

        return format_html(html)

    _linkify.short_description = [short_description, field_name.replace("_", " ").capitalize()][short_description is None]

    return _linkify