How to disallow empty selection in a relation field?

[YassienW]

I currently have a field that allows you to select multiple items from another model (O2M relation).
Is there a way to add validation so the user can't save an empty selection? I want to ensure that the list has at least one item

Removing the last item should return an error on save

The field doesn't have a setting to control null values, and item validation doesn't work. I couldn't find any info on the docs or online. Help would be appreciated

[aniruddhaadak80]

@YassienW Primitives (like Select or ToggleGroup) don''t have built-in "required min length" validation logic because they are uncontrolled view components.
You need to handle this at the form library level (e.g., React Hook Form + Zod) or application state.
If using radix-ui/react-form (new), you can use custom validation rules.
But purely within the primitive: No, onValueChange is where you would prevent the update if the new value is empty, or you validate on submit.

[YassienW]

I realized that this was posted in the wrong repo...closing