Rails Caching DB Queries and Best Practices

Question

The DB load on my site is getting really high so it is time for me to cache common queries that are being called 1000s of times an hour where the results are not changing. So f

Answer 1

I would go ahead and take a look at Memoization, which is now in Rails 2.2.

"Memoization is a pattern of initializing a method once and then stashing its value away for repeat use."

There was a great Railscast episode on it recently that should get you up and running nicely.

Quick code sample from the Railscast:

class Product < ActiveRecord::Base
  extend ActiveSupport::Memoizable

  belongs_to :category

  def filesize(num = 1)
    # some expensive operation
    sleep 2
    12345789 * num
  end
  memoize :filesize
end

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