re-enable markdown in custom columns

netbox/netbox/tables/columns.py

@@ -550,3 +550,28 @@ class MarkdownColumn(tables.TemplateColumn):
 
     def value(self, value):
         return value
+
+
+class CustomFieldMarkdownColumn(tables.TemplateColumn):
+    """
+    Render a Markdown string in a longtext custom column.
+    """
+    template_code = """
+    {% if value %}
+      {{ value|markdown }}
+    {% else %}
+      —
+    {% endif %}
+    """
+
+    def __init__(self, customfield, *args, **kwargs):
+        self.customfield = customfield
+        kwargs['accessor'] = Accessor(f'custom_field_data__{customfield.name}')
+        kwargs['template_code'] = self.template_code
+        if 'verbose_name' not in kwargs:
+            kwargs['verbose_name'] = customfield.label or customfield.name
+
+        super().__init__(*args, **kwargs)
+
+    def value(self, value):
+        return value

netbox/netbox/tables/tables.py

@@ -7,6 +7,7 @@ from django.db.models.fields.related import RelatedField
 from django_tables2.data import TableQuerysetData
 
 from extras.models import CustomField, CustomLink
+from extras.choices import CustomFieldTypeChoices
 from netbox.tables import columns
 from utilities.paginator import EnhancedPaginator, get_paginate_count
 
@@ -180,7 +181,7 @@ class NetBoxTable(BaseTable):
         content_type = ContentType.objects.get_for_model(self._meta.model)
         custom_fields = CustomField.objects.filter(content_types=content_type)
         extra_columns.extend([
-            (f'cf_{cf.name}', columns.CustomFieldColumn(cf)) for cf in custom_fields
+            (f'cf_{cf.name}', columns.CustomFieldMarkdownColumn(cf) if cf.type == CustomFieldTypeChoices.TYPE_LONGTEXT else columns.CustomFieldColumn(cf)) for cf in custom_fields
         ])
         custom_links = CustomLink.objects.filter(content_type=content_type, enabled=True)
         extra_columns.extend([