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aaronjensen/all_cache_key.rb

Created July 23, 2013 14:47
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all_cache_key.rb
module AllCacheKey
extend ActiveSupport::Concern
module ClassMethods
def cache_key
pluck("COUNT(*)", "MAX(updated_at)").flatten.map(&:to_i).join("-")
end
end
end
@aaronjensen
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Note the multi-valued pluck is a Rails 4 feature, Rails 3 will need something slightly different

@tortuetorche
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This is similar to Caching with Rails guide cache_key_for_products method, isn't it ?
Or i'ts more optimized ?

@ream88
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ream88 commented Sep 11, 2013

For Rails 3 you need a little bit more code:

def cache_key
  sql = select('COUNT(*), MAX(updated_at)').to_sql
  connection.execute(sql).to_a.flatten.map(&:to_i).join('-')
end

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