Fixes: #7336 - VLAN Translation (#17745)

* VLANTranslationPolicy and VLANTranslationRule models and all associated UI classes

* Change VLANTranslationPolicy to a PrimaryModel and make name unique

* Add serializer classes to InterfaceSerializer

* Remake migrations

* Add GraphQL typing

* Skip tagged models in test

* Missing migration

* Remove get_absolute_url methods

* Remove package-lock.json

* Rebuild migration and add constraints and field options

* Rebuild migrations

* Use DynamicModelChoiceField for policy field

* Make vlan_translation_policy fields on filtersets more consistent with existing __name convention

* Add vlan_translation_table to VMInterface detail page

* Add vlan_translation_policy to VMInterfaceSerializer

* Move vlan_translation_policy fields to model and filterset mixins

* Protect in-use policies against deletion

* Add vlan_translation_policy to fields in VMInterfaceSerializer

* Cleanup indentation

* Remove unnecessary ordering column

* Rebuild migrations

* Search methods and registration

* Ensure 'id' column is present by default

* Add graphql types/filters/schema for VLANTranslationRule

* Filterset tests

* View tests

* API and viewset tests (incomplete)

* Add tags to VLANTranslationRuleForm

* Complete viewset tests for VLANTranslationRule

* Make VLANTranslationRule.policy nullable (but still required)

* Revert "Make VLANTranslationRule.policy nullable (but still required)"

This reverts commit 4c1bb437ef1a0a3593e5fbb87f08a0f158ea8c47.

* Revert nullability

* Explicitly prefetch policy in graphql

* Documentation of new and affected models

* Add note about select_related in graphql

* Rework policy/rule documentation

* Move vlan_translation_policy into 802.1Q Switching fieldset

* Remove redundant InterfaceVLANTranslationTable

* Conditionally include vlan_translation_table in interface.html and vminterface.html

* Add description field to VLANTranslationRule

* Define vlan_translation_table conditionally

* Add policy (name) filter to VLANTranslationRuleFilterSet

* Revert changes to adding-models.md (moved to another PR)

* Dynamic table for linked rules in vlantranslationpolicy.html

* Misc cleanup

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

docs/models/ipam/vlantranslationpolicy.md

@@ -0,0 +1,26 @@
+# VLAN Translation Policies
+
+VLAN translation is a feature that consists of VLAN translation policies and [VLAN translation rules](./vlantranslationrule.md). Many rules can belong to a policy, and each rule defines a mapping of a local to remote VLAN ID (VID). A policy can then be assigned to an [Interface](../dcim/interface.md) or [VMInterface](../virtualization/vminterface.md), and all VLAN translation rules associated with that policy will be visible in the interface details.
+
+There are uniqueness constraints on `(policy, local_vid)` and on `(policy, remote_vid)` in the `VLANTranslationRule` model. Thus, you cannot have multiple rules linked to the same policy that have the same local VID or the same remote VID. A set of policies and rules might look like this:
+
+Policy 1:
+- Rule: 100 -> 200
+- Rule: 101 -> 201
+
+Policy 2:
+- Rule: 100 -> 300
+- Rule: 101 -> 301
+
+However this is not allowed:
+
+Policy 3:
+- Rule: 100 -> 200
+- Rule: 100 -> 300
+
+
+## Fields
+
+### Name
+
+A unique human-friendly name.

docs/models/ipam/vlantranslationrule.md

@@ -0,0 +1,19 @@
+# VLAN Translation Rules
+
+A VLAN translation rule represents a one-to-one mapping of a local VLAN ID (VID) to a remote VID. Many rules can belong to a single policy.
+
+See [VLAN translation policies](./vlantranslationpolicy.md) for an overview of the VLAN Translation feature.
+
+## Fields
+
+### Policy
+
+The [VLAN Translation Policy](./vlantranslationpolicy.md) to which this rule belongs.
+
+### Local VID
+
+VLAN ID (1-4094) in the local network which is to be translated to a remote VID.
+
+### Remote VID
+
+VLAN ID (1-4094) in the remote network to which the local VID will be translated.