Cucumber factory Show archive.org snapshot supports polymorphic associations out of the box. Just keep in mind that you need to use named associations for this purpose.

class Person < ApplicationModel
  has_many :buildings, inverse_of: :owner
end

class Company < ApplicationModel
  has_many :buildings, inverse_of: :owner
end

class Building < ApplicationModel
  belongs_to :owner, optional: true, polymorphic: true
end

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Works

Given there is a person with the name "Nice person"
  And there is a building with the owner "Nice person"

Does not work

Given there is a person with the name "Nice person"
  And there is a building with the owner above