add ModelLogEntry model

wagtail/core/migrations/0063_modellogentry.py

@@ -0,0 +1,37 @@
+# Generated by Django 3.1.12 on 2021-06-16 14:08
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('wagtailcore', '0062_comment_models_and_pagesubscription'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ModelLogEntry',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('label', models.TextField()),
+                ('action', models.CharField(blank=True, db_index=True, max_length=255)),
+                ('data_json', models.TextField(blank=True)),
+                ('timestamp', models.DateTimeField(verbose_name='timestamp (UTC)')),
+                ('content_changed', models.BooleanField(db_index=True, default=False)),
+                ('deleted', models.BooleanField(default=False)),
+                ('object_id', models.CharField(db_index=True, max_length=255)),
+                ('content_type', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to='contenttypes.contenttype', verbose_name='content type')),
+                ('user', models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='+', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'verbose_name': 'model log entry',
+                'verbose_name_plural': 'model log entries',
+                'ordering': ['-timestamp', '-id'],
+            },
+        ),
+    ]

wagtail/core/models/audit_log.py

@@ -185,3 +185,28 @@ class BaseLogEntry(models.Model):
             return self.formatter.format_comment(self)
         else:
             return ''
+
+
+class ModelLogEntryManager(BaseLogEntryManager):
+    def log_action(self, instance, action, **kwargs):
+        kwargs.update(object_id=str(instance.pk))
+        return super().log_action(instance, action, **kwargs)
+
+
+class ModelLogEntry(BaseLogEntry):
+    """
+    Simple logger for generic Django models
+    """
+    object_id = models.CharField(max_length=255, blank=False, db_index=True)
+
+    objects = ModelLogEntryManager()
+
+    class Meta:
+        ordering = ['-timestamp', '-id']
+        verbose_name = _('model log entry')
+        verbose_name_plural = _('model log entries')
+
+    def __str__(self):
+        return "ModelLogEntry %d: '%s' on '%s' with id %s" % (
+            self.pk, self.action, self.object_verbose_name(), self.object_id
+        )