Closes #12988: Introduce custom field choice sets (#13195)

* Initial work on custom field choice sets

* Rename choices to extra_choices (prep for #12194)

* Remove CustomField.choices

* Add & update tests

* Clean up table columns

* Add order_alphanetically boolean for choice sets

* Introduce ArrayColumn for choice lists

* Show dependent custom fields on choice set view

* Update custom fields documentation

* Introduce ArrayWidget for more convenient editing of choices

* Incorporate PR feedback

* Misc cleanup

netbox/extras/tables/tables.py

@@ -2,6 +2,7 @@ import json
 
 import django_tables2 as tables
 from django.conf import settings
+from django.utils.translation import gettext as _
 
 from extras.models import *
 from netbox.tables import NetBoxTable, columns
@@ -12,6 +13,7 @@ __all__ = (
     'ConfigContextTable',
     'ConfigRevisionTable',
     'ConfigTemplateTable',
+    'CustomFieldChoiceSetTable',
     'CustomFieldTable',
     'CustomLinkTable',
     'ExportTemplateTable',
@@ -64,6 +66,11 @@ class CustomFieldTable(NetBoxTable):
     required = columns.BooleanColumn()
     ui_visibility = columns.ChoiceFieldColumn(verbose_name="UI visibility")
     description = columns.MarkdownColumn()
+    choices = columns.ArrayColumn(
+        max_items=10,
+        orderable=False,
+        verbose_name=_('Choices')
+    )
     is_cloneable = columns.BooleanColumn()
 
     class Meta(NetBoxTable.Meta):
@@ -76,6 +83,33 @@ class CustomFieldTable(NetBoxTable):
         default_columns = ('pk', 'name', 'content_types', 'label', 'group_name', 'type', 'required', 'description')
 
 
+class CustomFieldChoiceSetTable(NetBoxTable):
+    name = tables.Column(
+        linkify=True
+    )
+    choices = columns.ArrayColumn(
+        max_items=10,
+        accessor=tables.A('extra_choices'),
+        orderable=False,
+        verbose_name=_('Choices')
+    )
+    choice_count = tables.TemplateColumn(
+        accessor=tables.A('extra_choices'),
+        template_code='{{ value|length }}',
+        orderable=False,
+        verbose_name=_('Count')
+    )
+    order_alphabetically = columns.BooleanColumn()
+
+    class Meta(NetBoxTable.Meta):
+        model = CustomFieldChoiceSet
+        fields = (
+            'pk', 'id', 'name', 'description', 'choice_count', 'choices', 'order_alphabetically', 'created',
+            'last_updated',
+        )
+        default_columns = ('pk', 'name', 'choice_count', 'description')
+
+
 class CustomLinkTable(NetBoxTable):
     name = tables.Column(
         linkify=True