FR: Allow models to be set as string in AdminChooser

[uroybd]

Currently, I'm facing circular dependency in AdminChooser and solved this by importing the Model in the __init__ like this:

from django.contrib.admin.utils import quote
from django.urls import reverse
from django.utils.translation import gettext_lazy as _

from generic_chooser.widgets import AdminChooser


class DepartmentChooser(AdminChooser):
    def __init__(self, **kwargs):
        from career.models import Department
        self.model = Department
        super().__init__(**kwargs)
        
    choose_one_text = _('Choose a department')
    choose_another_text = _('Choose another department')
    link_to_chosen_text = _('Edit this department')
    choose_modal_url_name = 'department_chooser:choose'

    def get_edit_item_url(self, item):
        from career.wagtail_hooks import DepartmentAdmin
        admin = DepartmentAdmin()
        return admin.url_helper.get_action_url('edit', item.pk)

While it works, it's not really ideal.

Allowing model to be set as String (like SnippetChooserPanel) and resolving it dynamically will provide great ergonomics I believe.

[coredumperror]

Seconding this request!

I just had to run down a circular import that I couldn't quite determine the cause of, until I realized that my widgets.py was importing my choosable class, and my choosable class was defined in the same file as the model that uses my widget in its form panels.