base setup

at_django_boilerplate/history_tracker/models.py

@@ -0,0 +1,30 @@
+from django.db import models
+from at_django_boilerplate.utils.mixins import HashidSlugMixin
+
+from django.conf import  settings
+from django.utils import  timezone
+
+class TrackedChange(HashidSlugMixin):
+    CHANGE_TYPE = (('add','Add'),
+                   ('edit','Edit'),
+                   ('delete','Delete'),
+                   )
+    existing = models.TextField(null=True,blank=True)
+    change = models.TextField(null=True,blank=True)
+    change_type = models.CharField(choices=CHANGE_TYPE,default='add',max_length=10)
+    change_done_by = models.ForeignKey(settings.AUTH_USER_MODEL,
+                                       null=True,
+                                       blank=True,
+                                       on_delete=models.DO_NOTHING,
+                                       related_name='changes_by_me')
+    for_utility = models.ForeignKey('meters.UtilityModel',null=True,blank=True,on_delete=models.DO_NOTHING,related_name='utility_changes')
+    applied_on = models.DateTimeField(default=timezone.now)
+
+    def __str__(self):
+        if self.change_type=='add':
+            return f'{self.change_done_by} added {self.change}'
+        elif self.change_type=='edit':
+            return f'{self.change_done_by} updated {self.existing} to {self.change}'
+
+        elif self.change_type=='delete':
+            return f'{self.change_done_by} deleted {self.change}'