File cache store is limited by filename length constraint.

[gib]

The following error came up in development with long URL cache keys:

File name too long - /Users/gib/Code/artsy/gravity/gib/tmp/cache/proxied_binding%3DGarner%3A%3AMixins%3A%3AMongoid%3A%3AIdentity%2Fklass%3DArtwork%2Chandle%3Dkammy-roulner-when-confronted-with-a-piece-of-art-dot-dot-dot%2Fstrategy%3DGarner%3A%3AStrategies%3A%3ABinding%3A%3AKey%3A%3ABindingIndex20130704-19291-s7dqiv.lock

Thanks for the speedy response and suggestions @fancyremarker!

[fancyremarker]

This seems more of an issue with the underlying cache store, per rails/rails#10894, but I'm taking a look into a reasonable fix within Garner.

[fancyremarker]

So, rails/rails#4907 is actually the more relevant issue, and rails/rails#4911 fixes this. In lieu of upgrading to Rails 4.0, I recommend something like the following in an initializer:

silence_warnings do
  ActiveSupport::Cache::FileStore::FILENAME_MAX_SIZE = 228
end

[gib]

Cool! Thanks!!

[dblock]

Setting the max size didn't work. One workaround is to use a MemoryStore. Another is a possible monkey patch:

module Garner
  module Cache

    private

    class << self

      alias_method :_compound_key, :compound_key

      def compound_key(bindings, key_hash)
        key = _compound_key(bindings, key_hash)
        Digest::SHA1.hexdigest(key.to_s) if key
      end

    end

  end
end

[joeyAghion]

File paths of unlimited length seem problematic even if we're able to work around this particular obstacle. Are there any drawbacks to using the digest instead?