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from __future__ import annotations
from typing import Any
from django.contrib import admin
from django.db.models import Model
from django.http import HttpRequest, HttpResponse, HttpResponseRedirect
from django.urls import URLPattern, re_path
from django.utils.encoding import force_str
from django.utils.translation import gettext as _
from django_solo import settings as solo_settings
from django_solo.models import DEFAULT_SINGLETON_INSTANCE_ID
class SingletonModelAdmin(admin.ModelAdmin): # type: ignore[type-arg]
object_history_template = "admin/solo/object_history.html"
change_form_template = "admin/solo/change_form.html"
def has_add_permission(self, request: HttpRequest) -> bool:
return False
def has_delete_permission(self, request: HttpRequest, obj: Model | None = None) -> bool:
return False
def get_urls(self) -> list[URLPattern]:
urls = super().get_urls()
if not solo_settings.SOLO_ADMIN_SKIP_OBJECT_LIST_PAGE:
return urls
# _meta.model_name only exists on Django>=1.6 -
# on earlier versions, use module_name.lower()
try:
model_name = self.model._meta.model_name
except AttributeError:
model_name = self.model._meta.module_name.lower()
self.model._meta.verbose_name_plural = self.model._meta.verbose_name
url_name_prefix = f"{self.model._meta.app_label}_{model_name}"
custom_urls = [
re_path(
r"^history/$",
self.admin_site.admin_view(self.history_view),
{"object_id": str(self.singleton_instance_id)},
name=f"{url_name_prefix}_history",
),
re_path(
r"^$",
self.admin_site.admin_view(self.change_view),
{"object_id": str(self.singleton_instance_id)},
name=f"{url_name_prefix}_change",
),
]
# By inserting the custom URLs first, we overwrite the standard URLs.
return custom_urls + urls
def response_change(self, request: HttpRequest, obj: Model) -> HttpResponseRedirect:
msg = _("{obj} was changed successfully.").format(obj=force_str(obj))
if "_continue" in request.POST:
self.message_user(request, msg + " " + _("You may edit it again below."))
return HttpResponseRedirect(request.path)
else:
self.message_user(request, msg)
return HttpResponseRedirect("../../")
def change_view(
self,
request: HttpRequest,
object_id: str,
form_url: str = "",
extra_context: dict[str, Any] | None = None,
) -> HttpResponse:
if object_id == str(self.singleton_instance_id):
self.model.objects.get_or_create(pk=self.singleton_instance_id)
if not extra_context:
extra_context = {}
extra_context["skip_object_list_page"] = solo_settings.SOLO_ADMIN_SKIP_OBJECT_LIST_PAGE
return super().change_view(
request,
object_id,
form_url=form_url,
extra_context=extra_context,
)
def history_view(
self, request: HttpRequest, object_id: str, extra_context: dict[str, Any] | None = None
) -> HttpResponse:
if not extra_context:
extra_context = {}
extra_context["skip_object_list_page"] = solo_settings.SOLO_ADMIN_SKIP_OBJECT_LIST_PAGE
return super().history_view(
request,
object_id,
extra_context=extra_context,
)
@property
def singleton_instance_id(self) -> int:
return getattr(self.model, "singleton_instance_id", DEFAULT_SINGLETON_INSTANCE_ID)
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