showCreateRelationButton() not including Related Model Field

[jjjrmy]

• Nova Version: 4.8.1

/nova/Input.php

BelongsToMany::('Options')->showCreateRelationButton()

/nova/resources/inputs/<id>/attach/options?viaRelationship=options&polymorphic=0

When I click the Create button on the Relationship, I want to be able to know the ID of the requesting Resource for use in the Modal: to get the Input's ID.
It should be possible in the NovaRequest $request but I am not seeing anything.

[crynobone]

Duplicate of #3335

[frtess]

I'm also wondering about this. How can I specify default values, filter dropdowns or completely customize the "Attach" screen. If I can override the "Attach resource" on the parent resource, I'll just make a custom [resource]AttachTool, but can I do this ?

I'm new to Nova but a seasoned developer. I find Nova incredibly powerful, for basic crud (including Laravel relationships), but it seems to lack in term of API documentation. To achieve their moto "Making [us] the most productive developers", complete docs on the extents of possible customizations are needed.

[jjjrmy]

Here is an example of why this is necessary:

A Form hasMany Steps, and also belongsTo it's First Step.
So when Updating (and Creating) the Form, it's not possible to create it's First Step because you can't set the belongsTo on the Step that's being newly created - even though the Form model already exists.

The issue is even more complex when Creating, because the Form model doesn't exist yet, but not sure if there is a solution for that.