add helper to show CRUD history for particular object

easyaudit/crudhistory_admin_mixin.py

@@ -0,0 +1,104 @@
+from urllib.parse import urlencode
+
+from django.contrib import admin
+from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
+from django.contrib.contenttypes.models import ContentType
+from django.db.models import Model
+from django.http import HttpRequest, HttpResponseRedirect
+from django.shortcuts import redirect
+from django.urls import path, reverse
+from django.utils.html import format_html
+from django.utils.translation import ugettext_lazy as _
+
+
+class BaseProcessActionsAdminMixin:
+    def get_action_methods(self):
+        return {}
+
+    def _get_path_info(self):
+        return self.model._meta.app_label, self.model._meta.model_name
+
+    def get_redirect_url__to_referer(self, request: HttpRequest):
+        preserved_filters = self.get_preserved_filters(request)
+        opts = self.model._meta
+
+        redirect_url = add_preserved_filters(
+            {'preserved_filters': preserved_filters, 'opts': opts},
+            request.META.get('HTTP_REFERER', '/'),
+        )
+
+        return redirect_url
+
+    def process_action(
+        self, request, obj_id, action_key, **kwargs,
+    ):
+        action_methods = self.get_action_methods()
+        action = action_methods[action_key]
+        obj = self.get_object(request, obj_id)
+        return action(request, obj)
+
+
+class CRUDHistoryAdminMixin(BaseProcessActionsAdminMixin, admin.ModelAdmin):
+    CRUD_HISTORY = "crud_history"
+    crud_history_translated_title = _('CRUD history')
+
+    def get_urls(self) -> list:
+        urls = super(CRUDHistoryAdminMixin, self).get_urls()
+        info = self._get_path_info()
+        crud_history_urls = [
+            path(
+                f'<path:object_id>/{self.CRUD_HISTORY}/',
+                self.admin_site.admin_view(self.crud_history_view),
+                name=f'%s_%s_{self.CRUD_HISTORY}' % info,
+            ),
+        ]
+        return crud_history_urls + urls
+
+    def get_action_methods(self) -> dict:
+        methods = super(CRUDHistoryAdminMixin, self).get_action_methods()
+        methods.update(
+            {self.CRUD_HISTORY: self.crud_history_action,}
+        )
+        return methods
+
+    def crud_history_view(self, request: HttpRequest, object_id: int):
+        return self.process_action(request, object_id, self.CRUD_HISTORY)
+
+    def crud_history_action(self, request: HttpRequest, obj: Model) -> HttpResponseRedirect:
+        base_history_url = reverse(f"admin:easyaudit_crudevent_changelist", )
+        app_label, model_name = self._get_path_info()
+        content_type = ContentType.objects.get_by_natural_key(app_label, model_name)
+        params = {
+            # "content_type__app_label": app_label,
+            "content_type__id": content_type.id,
+            # "content_type__model_name": model_name,
+            "object_id": obj.id,
+        }
+        params = urlencode(params)
+        history_url = f"{base_history_url}?{params}"
+
+        return redirect(history_url)
+
+    crud_history_action.short_description = crud_history_translated_title
+
+    def get_crud_history_url(self, obj: Model) -> str:
+        info = self._get_path_info()
+        return reverse(f'admin:%s_%s_{self.CRUD_HISTORY}' % info, args=[obj.pk])
+
+    def crud_history_link(self, obj: Model) -> str:
+        crud_history_url = self.get_crud_history_url(obj=obj)
+        crud_history_a = (
+            f"<a href={crud_history_url}>> {self.crud_history_translated_title}</a>"
+        )
+        return format_html(crud_history_a)
+
+    crud_history_link.allow_tags = True
+    crud_history_link.short_description = crud_history_translated_title
+
+
+# Example
+class SomeModelAdmin(CRUDHistoryAdminMixin):
+    list_display = (
+        "id",
+        "crud_history_link",
+    )