admin: remove duplicate code into new base classes

passbook/admin/views/utils.py

@@ -0,0 +1,73 @@
+"""passbook admin util views"""
+from typing import Any, Dict
+
+from django.contrib import messages
+from django.contrib.messages.views import SuccessMessageMixin
+from django.http import Http404
+from django.views.generic import DeleteView, ListView, UpdateView
+
+from passbook.lib.utils.reflection import all_subclasses, path_to_class
+from passbook.lib.views import CreateAssignPermView
+
+
+class DeleteMessageView(SuccessMessageMixin, DeleteView):
+    """DeleteView which shows `self.success_message` on successful deletion"""
+
+    def delete(self, request, *args, **kwargs):
+        messages.success(self.request, self.success_message)
+        return super().delete(request, *args, **kwargs)
+
+
+class InheritanceListView(ListView):
+    """ListView for objects using InheritanceManager"""
+
+    def get_context_data(self, **kwargs):
+        kwargs["types"] = {x.__name__: x for x in all_subclasses(self.model)}
+        return super().get_context_data(**kwargs)
+
+    def get_queryset(self):
+        return super().get_queryset().select_subclasses()
+
+
+class InheritanceCreateView(CreateAssignPermView):
+    """CreateView for objects using InheritanceManager"""
+
+    def get_form_class(self):
+        provider_type = self.request.GET.get("type")
+        try:
+            model = next(
+                x for x in all_subclasses(self.model) if x.__name__ == provider_type
+            )
+        except StopIteration as exc:
+            raise Http404 from exc
+        return path_to_class(model.form)
+
+    def get_context_data(self, **kwargs: Any) -> Dict[str, Any]:
+        kwargs = super().get_context_data(**kwargs)
+        form_cls = self.get_form_class()
+        if hasattr(form_cls, "template_name"):
+            kwargs["base_template"] = form_cls.template_name
+        return kwargs
+
+
+class InheritanceUpdateView(UpdateView):
+    """UpdateView for objects using InheritanceManager"""
+
+    def get_context_data(self, **kwargs: Any) -> Dict[str, Any]:
+        kwargs = super().get_context_data(**kwargs)
+        form_cls = self.get_form_class()
+        if hasattr(form_cls, "template_name"):
+            kwargs["base_template"] = form_cls.template_name
+        return kwargs
+
+    def get_form_class(self):
+        form_class_path = self.get_object().form
+        form_class = path_to_class(form_class_path)
+        return form_class
+
+    def get_object(self, queryset=None):
+        return (
+            self.model.objects.filter(pk=self.kwargs.get("pk"))
+            .select_subclasses()
+            .first()
+        )