option.rb

class Rating::Option < ApplicationRecord
    belongs_to :rating_type, class_name: 'Rating::Type', :foreign_key => "rating_type_id"
    has_many :rating_scores, class_name: 'Rating::Score', :foreign_key => "rating_option_id", dependent: :destroy
end

score.rb

class Rating::Score < ApplicationRecord
    belongs_to :rating_type, class_name: 'Rating::Type', :foreign_key => "rating_type_id"
    belongs_to :rating_option, class_name: 'Rating::Option', :foreign_key => "rating_option_id"
end

type.rb

class Rating::Type < ApplicationRecord
    has_many :rating_options, class_name: 'Rating::Option', :foreign_key => "rating_type_id", dependent: :destroy
    has_many :rating_scores, class_name: 'Rating::Score', :foreign_key => "rating_type_id", dependent: :destroy
    accepts_nested_attributes_for :rating_options, allow_destroy: true
end