STI, asciidoc & polymorphic associations

Document and Manual share one table via single-table inheritance; the derived type column shows which is which, and Manual inherits Document's crud_structure (the gem walks the superclass). The body renders with as: :asciidoc. Comment has a polymorphic belongs_to :commentable — the cell links back to whichever model (a Book or a Document) owns the comment.

class Document < ApplicationRecord            # Manual < Document (STI)
  include CrudComponents::Model
  crud_structure do
    attribute :body, as: :asciidoc
    fieldset :index, %i[type title created_at]   # `type` = STI discriminator
    fieldset :show,  %i[type title body created_at]
  end
end

belongs_to :commentable, polymorphic: true
fieldset :index, %i[commentable body created_at]   # commentable → nil-safe link to Book or Document

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