Default values for showCreateRelationButton

[JeroenHauser]

Hi all, first: thanks for developing and maintaining Nova actively, it's been a great help in quickly setting up a CRUD admin panel. For most of my questions I can find the answer in the docs or somewhere on the web. Also love the community support.

Now I think I stumbled on what would be a feature request. I'd like to pass default values via the showCreateRelationButton method on a BelongsTo field in my Resource.

This is the case why:

I'm developing a small reservations platform for an indoor child playground. Central here are Families. Then we have Children that belong to a Family, Families have many Children. And Reservations that belong to a Family, Families have many Reservations. When it's a child's birthday, we need to know for whose birthday the Reservation is for. So Reservations not only belong to a Family, but also belong to a Child, and Children have many Reservations (because of multiple birthday years). For maintaining all these Resources I use Nova.

We don't want admins to move Children from the one Family to another, that could become messy and is a privacy risk. But since admins must be able to see what Family a Child belongs to, the family_id BelongsTo field in the Child Nova Resource is readonly.

Now the admin is on a Reservation edit screen. The user forgot to / didn't provide a Child name in the reservation form and calls the service desk. The admin wants to create a Child from the Reservation edit screen. For this, I used the showCreateRelationButton method on the child_id BelongsTo field.

So when an admin click on the (+) button, the Child form modal opens, and... the family_id BelongsTo field is disabled! And in fact, I don't want the admin to be able to "choose" a Family for this new Child at all. There is only one possibility here: this new Child needs to belong to the same Family as the Family that made the Reservation (to what Family the Reservation belongs to).

This is why I need to provide default values when enabling this modal. Of course, the reservation_id will be filled automatically, since the admin is creating the Child from the Reservation edit form. But the family_id needs to be prefilled as well while not being editable by the admin.

Hope my feature request is clear and that this will end up on your roadmap! 😉

[JeroenHauser]

Suggestion:
BelongsTo::make('child_id')->showCreateRelationButton(true, ['family_id' => $this->family_id])