Merge pull request #8441 from seulsale/8391-install-date-null

Fixes #8391: Install date should appear empty when exported

Author: jeremystretch

netbox/utilities/tables.py

@@ -4,10 +4,13 @@
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import FieldDoesNotExist
+from django.db.models import DateField, DateTimeField
 from django.db.models.fields.related import RelatedField
 from django.urls import reverse
+from django.utils.formats import date_format
 from django.utils.safestring import mark_safe
 from django_tables2 import RequestConfig
+from django_tables2.columns import library
 from django_tables2.data import TableQuerysetData
 from django_tables2.utils import Accessor
 
@@ -205,6 +208,42 @@ def value(self, **kwargs):
         return ret
 
 
+@library.register
+class DateColumn(tables.DateColumn):
+    """
+    Overrides the default implementation of DateColumn to better handle null values, returning a default value for
+    tables and null when exporting data. It is registered in the tables library to use this class instead of the
+    default, making this behavior consistent in all fields of type DateField.
+    """
+
+    def value(self, value):
+        return value
+
+    @classmethod
+    def from_field(cls, field, **kwargs):
+        if isinstance(field, DateField):
+            return cls(**kwargs)
+
+
+@library.register
+class DateTimeColumn(tables.DateTimeColumn):
+    """
+    Overrides the default implementation of DateTimeColumn to better handle null values, returning a default value for
+    tables and null when exporting data. It is registered in the tables library to use this class instead of the
+    default, making this behavior consistent in all fields of type DateTimeField.
+    """
+
+    def value(self, value):
+        if value:
+            return date_format(value, format="SHORT_DATETIME_FORMAT")
+        return None
+
+    @classmethod
+    def from_field(cls, field, **kwargs):
+        if isinstance(field, DateTimeField):
+            return cls(**kwargs)
+
+
 class ButtonsColumn(tables.TemplateColumn):
     """
     Render edit, delete, and changelog buttons for an object.