feat(core): history model for saving model history

!9 #5

app/core/models/history.py

@@ -0,0 +1,96 @@
+from django.contrib.auth.models import User
+from django.db import models
+
+from access.fields import *
+from access.models import TenancyObject
+
+
+
+class NotesCommonFields(models.Model):
+
+    class Meta:
+        abstract = True
+
+    id = models.AutoField(
+        primary_key=True,
+        unique=True,
+        blank=False
+    )
+
+    created = AutoCreatedField()
+
+
+
+class History(TenancyObject, NotesCommonFields):
+
+
+    class Meta:
+
+        ordering = [
+            '-created'
+        ]
+
+
+    class Actions(models.TextChoices):
+        ADD = '1', 'Create'
+        UPDATE = '2', 'Update'
+        DELETE = '3', 'Delete'
+
+
+    before = models.TextField(
+        help_text = 'JSON Object before Change',
+        blank = True,
+        default = None,
+        null = True
+    )
+
+
+    after = models.TextField(
+        help_text = 'JSON Object After Change',
+        blank = True,
+        default = None,
+        null = True
+    )
+
+
+    action = models.IntegerField(
+        choices=Actions,
+        default=None,
+        null=True,
+        blank = False,
+    )
+
+
+    user = models.ForeignKey(
+        User,
+        on_delete=models.DO_NOTHING,
+        blank= False,
+    )
+
+    item_pk = models.IntegerField(
+        default=None,
+        null = True,
+        blank = False,
+    )
+
+    item_class = models.CharField(
+        blank = False,
+        default=None,
+        null = True,
+        max_length = 50,
+        unique = False,
+    )
+
+    item_parent_pk = models.IntegerField(
+        default=None,
+        null = True,
+        blank = False,
+    )
+
+    item_parent_class = models.CharField(
+        blank = False,
+        default=None,
+        null = True,
+        max_length = 50,
+        unique = False,
+    )

app/core/models/notes.py

@@ -44,7 +44,7 @@ class Notes(NotesCommonFields):
 
     note = models.TextField(
         verbose_name = 'Note',
-        blank = False,
+        blank = True,
         default = None,
         null = True
     )