sr_custom.rb

# config/initializers/strong_resources.rb

Parameters = ActionController::Parameters

# first, define our custom type according to the stronger_parameters documentation
custom_type = Parameters.array(Parameters.id)

# then, register this custom type with strong resources. we need:
# * a name for the type (:array_of_integers)
# * since swagger only allows certain types, how should swagger handle this type?
# * the type defined above
strong_param :array_of_integers, swagger: :array, type: custom_type

strong_resource :thing do
  # And now use it just like you would :string, :integer, etc
  attribute :foo, :array_of_integers
end