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retrieve_cache_key(key) private

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# File activesupport/lib/active_support/cache.rb, line 95
        def retrieve_cache_key(key)
          case
          when key.respond_to?(:cache_key_with_version) then key.cache_key_with_version
          when key.respond_to?(:cache_key)              then key.cache_key
          when key.is_a?(Array)                         then key.map { |element| retrieve_cache_key(element) }.to_param
          when key.respond_to?(:to_a)                   then retrieve_cache_key(key.to_a)
          else                                               key.to_param
          end.to_s
        end
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