Failing has_one through association

has_one_through_failure.rb

class Listing < ActiveRecord::Base
  belongs_to :owner, polymorphic: true
  belongs_to :property, polymorphic: true
  
  validates :active, inclusion: { in: [true, false] }
end

class Car < ActiveRecord::Base
  has_many :listings, as: :property, inverse_of: :property
end

class Boat < ActiveRecord::Base
  has_many :listings, as: :property, inverse_of: :property
end

class House < ActiveRecord::Base
  has_many :listings, as: :property, inverse_of: :property
end

class Person < ActiveRecord::Base
  has_many :listings, as: :owner, inverse_of: :owner
  has_many :cars, through: :listings, source: :property, source_type: 'Car'
  has_many :boats, through: :listings, source: :property, source_type: 'Boat'
  has_many :houses, through: :listings, source: :property, source_type: 'House'
  
  has_many :active_listings, -> { where active: true }, as: :owner, inverse_of: :owner
  
  # This fails
  has_one :active_car, through: :active_listings, source: :property, source_type: 'Car'

  # ActiveRecord::HasOneThroughCantAssociateThroughCollection:
  #  Cannot have a has_one :through association 'Person#active_card' where the :through association 
  #  'Person#active_listings' is a collection. 
  #  Specify a has_one or belongs_to association in the :through option instead.
end