In case when you want to use different models depending on some condition you can use StoreModel.one_of method:
OneOfConfigurations = StoreModel.one_of do |json|
json[:v] == 2 ? ConfigurationV2 : Configuration
end
class Product < ApplicationRecord
attribute :configuration, OneOfConfigurations.to_type
end
class ProductList < ApplicationRecord
attribute :configurations, OneOfConfigurations.to_array_type
end