feat(core): Audit History Signal for Delete/Save

ref: #765 #759

app/core/signal/audit_history.py

@@ -0,0 +1,41 @@
+from django.apps import apps
+from django.contrib.auth.models import ContentType
+from django.db.models.signals import (
+    post_delete,
+    post_save
+)
+from django.dispatch import receiver
+
+from core.middleware.get_request import get_request
+
+
+@receiver(post_delete, dispatch_uid="audit_history_delete")
+@receiver(post_save, dispatch_uid="audit_history_save")
+def audit_history(sender, instance, **kwargs):
+
+    if getattr(instance, 'audit_enabled', False):
+
+        audit_model = apps.get_model( instance._meta.object_name + 'AuditHistory')
+
+        audit_action = audit_model.Actions.UPDATE
+
+        if instance.get_before() == {}:
+
+            audit_action = audit_model.Actions.ADD
+
+        elif instance.get_after() == {}:
+
+            audit_action = audit_model.Actions.DELETE
+
+
+        history = audit_model.objects.create(
+            organization = instance.organization,
+            content_type = ContentType.objects.get(
+                app_label = instance._meta.app_label,
+                model = instance._meta.model_name,
+            ),
+            before = instance.get_before(),
+            after = instance.get_after(),
+            action = audit_action,
+            user = get_request().user
+        )