Using belongs_to in attach_fields causes error

[rctneil]

Describe the bug

When using a belongs_to field inside attach_fields

I'm assuming it's because the join table record does not exist at that point? That's my guess anyway!

attach_fields:

                    attach_fields: -> {
                        field :role, as: :text
                        field :companyable_type, as: :hidden,
                            default: "Attraction" # Hardcode type to ensure the polymorphic has_many :through works.
                        field :model, as: :belongs_to, use_resource: Avo::Resources::Model
                    }

Companyable:

  class Companyable < ApplicationRecord
    belongs_to :company
    belongs_to :companyable, polymorphic: true
    belongs_to :model, optional: true

Model:

class Model < ApplicationRecord
  has_many :companyables
  has_many :submodels
end