View deleted instances from admin page

The SimpleHistoryAdmin allows the history of a instance that still exists to bee seen. It would be great if there would be a way to view a list of deleted instances, and see their histories.

[rhaver]

Collating the snippets by @marco-silva0000, you can define a new admin type SimpleHistoryWithDeletedAdmin. Any model admin class that derives from it includes the filter that lists deleted objects.

from django.contrib import admin
from django.contrib.admin.utils import quote
from django.urls import reverse
from simple_history.admin import SimpleHistoryAdmin

class SimpleHistoryWithDeletedAdmin(SimpleHistoryAdmin):
  class SimpleHistoryShowDeletedFilter(admin.SimpleListFilter):
    title = "Entries"
    parameter_name = "entries"

    def lookups(self, request, model_admin):
      return (
        ("deleted_only", "Only Deleted"),
      )

    def queryset(self, request, queryset):
      if self.value():
        return queryset.model.history.filter(history_type='-').distinct()
      return queryset

  def get_changelist(self, request, **kwargs):
    def url_from_result_maker(history=False):
      def custom_url_for_result(self, result):
        pk = getattr(result, self.pk_attname)
        route_type = 'history' if history else 'change'
        route = f'{self.opts.app_label}_{self.opts.model_name}_{route_type}'
        return reverse(f'admin:{route}',
                       args=(quote(pk),),
                       current_app=self.model_admin.admin_site.name)
      return custom_url_for_result
    
    changelist = super().get_changelist(request, **kwargs)
    if request.GET.get('entries', None) == 'deleted_only':
      changelist.url_for_result = url_from_result_maker(history=True)
    else:
      changelist.url_for_result = url_from_result_maker(history=False)
    return changelist
  
  def get_list_filter(self, request):
    return [self.SimpleHistoryShowDeletedFilter] + [
      f for f in super().get_list_filter(request)
    ]

[Visgean]

Any progress on this?