bug: create/update mutation allows you to set a parent for the "root" of a hierarchy

[wvandeun]

Component

API Server / GraphQL

Infrahub version

0.16.0.dev0

Current Behavior

When you define a hierarchy in the schema, we define the root of hierarchy by specifying setting an empty parent.
We should therefor not be able to set a parent for nodes that are at the root level of the hierarchy.
It seems that it is possible to set a parent for nodes at the root level, as long as the node that you want to add a parent is inheriting from the generic that defines the hierarchy.

Expected Behavior

We should not be able to define a parent for a node that is at the root of a hierarchy.

Steps to Reproduce

• load instance of Infrahub
• load the demo schema
• load the demo data
• navigate to continent in the web UI
• select Europe and click on the edit button
• in the parent dropdown select country
• set the country to Australia
• click save
• Austrailia is now the parent of Europe
• Europe dissapears from the hierarchy tree under Australia

Additional Information

No response

[dgarros]

Fixed in #4414