Show field values before deletion in the admin

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changes
 
+#### Improvements
+
+- feat: Display the diff for deleted objects in the admin ([#396](https://github.com/jazzband/django-auditlog/pull/396))
+
 ## 2.1.0 (2022-06-27)
 
 #### Improvements

auditlog/mixins.py

@@ -60,8 +60,6 @@ class LogEntryAdminMixin:
     msg_short.short_description = "Changes"
 
     def msg(self, obj):
-        if obj.action == LogEntry.Action.DELETE:
-            return ""  # delete
         changes = json.loads(obj.changes)
 
         atom_changes = {}

auditlog_tests/tests.py

@@ -1274,9 +1274,21 @@ class DiffMsgTest(TestCase):
         )
 
     def test_changes_msg_delete(self):
-        log_entry = self._create_log_entry(LogEntry.Action.DELETE, {})
+        log_entry = self._create_log_entry(
+            LogEntry.Action.DELETE,
+            {"field one": ["value before deletion", None], "field two": [11, None]},
+        )
 
-        self.assertEqual(self.admin.msg(log_entry), "")
+        self.assertEqual(
+            self.admin.msg(log_entry),
+            (
+                "<table>"
+                "<tr><th>#</th><th>Field</th><th>From</th><th>To</th></tr>"
+                "<tr><td>1</td><td>field one</td><td>value before deletion</td><td>None</td></tr>"
+                "<tr><td>2</td><td>field two</td><td>11</td><td>None</td></tr>"
+                "</table>"
+            ),
+        )
 
     def test_changes_msg_create(self):
         log_entry = self._create_log_entry(