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Cache Key Versioning with a Single “namespace”

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                  class CacheNamespace
  def initialize(name)
    @name = name
  end

  def version
    Rails.cache.fetch("cache_ns:#{@name}", expires_in: 1.year) { SecureRandom.hex(6) }
  end

  def bump!
    Rails.cache.write("cache_ns:#{@name}", SecureRandom.hex(6), expires_in: 1.year)
  end
end

                  ns = CacheNamespace.new('trending_snips')
Rails.cache.fetch("trending:#{ns.version}", expires_in: 10.minutes) { Snip.trending.limit(20).to_a }

When cache structures change, you want to invalidate safely without flushing the world. Use a namespace version key (per feature) and incorporate it into cache keys.

Sarah Chen

More from Sarah Chen

Cache Key Versioning with a Single “namespace”

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More from Sarah Chen