active model serializer result.json

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representer.rb

module Dominions4
  class Era < ::ActiveRecord::Base
    module Representer
      class Index < Roar::Decorator
        feature Roar::JSON::JSONAPI

        type :dominions4_eras

        property :id
        property :name
        property :abbreviation
        property :slug
        property :description

        has_many :nations, class: ::Dominions4::Nation do
          type :dominions4_nations

          property :id
          property :name
          property :epithet
          property :slug
        end
      end
    end
  end
end

result.json

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Mages have lost some of their former power and magic resources are not as abundant as before."},"relationships":{"data":{"type":null,"id":"","attributes":{"nations":[{"data":{"type":"dominions4_nations","id":"42"}},{"data":{"type":"dominions4_nations","id":"47"}},{"data":{"type":"dominions4_nations","id":"88"}},{"data":{"type":"dominions4_nations","id":"39"}},{"data":{"type":"dominions4_nations","id":"40"}},{"data":{"type":"dominions4_nations","id":"41"}},{"data":{"type":"dominions4_nations","id":"43"}},{"data":{"type":"dominions4_nations","id":"44"}},{"data":{"type":"dominions4_nations","id":"45"}},{"data":{"type":"dominions4_nations","id":"46"}},{"data":{"type":"dominions4_nations","id":"48"}},{"data":{"type":"dominions4_nations","id":"49"}},{"data":{"type":"dominions4_nations","id":"50"}},{"data":{"type":"dominions4_nations","id":"51"}},{"data":{"type":"dominions4_nations","id":"52"}},{"data":{"type":"dominions4_nations","id":"53"}},{"data":{"type":"dominions4_nations","id":"54"}},{"data":{"type":"dominions4_nations","id":"55"}},{"data":{"type":"dominions4_nations","id":"57"}},{"data":{"type":"dominions4_nations","id":"58"}},{"data":{"type":"dominions4_nations","id":"87"}},{"data":{"type":"dominions4_nations","id":"89"}},{"data":{"type":"dominions4_nations","id":"90"}},{"data":{"type":"dominions4_nations","id":"33"}},{"data":{"type":"dominions4_nations","id":"34"}},{"data":{"type":"dominions4_nations","id":"35"}},{"data":{"type":"dominions4_nations","id":"36"}},{"data":{"type":"dominions4_nations","id":"37"}},{"data":{"type":"dominions4_nations","id":"38"}}]}}}},{"type":"dominions4_eras","id":"3","attributes":{"name":"Late Ages","abbreviation":"LA","slug":"late-ages","description":"In the late ages, iron and steel are readily available and used to arm most troops. 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