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ActiveRecord: cache column information (See related posts)

// Cache the column information so that no more query will be
// sent to the server thereafter

class ActiveRecord::Base
	
	@@_cached_columns = {}
	class << self
		
		alias :old_columns :columns
		
		def columns
			return @@_cached_columns[table_name] if @@_cached_columns[table_name]
			@@_cached_columns[table_name] = old_columns
		end
		
	end
	
end
to ruby rails activerecord on by jbeduya on Fri Apr 27 17:24:48 -0400 2007

Comments on this post

sprsquish posts on Apr 28, 2007 at 01:49
out of curiosity.. why didn't you use

@@_cached_columns[table_name] ||= old_columns
tomafro posts on Apr 28, 2007 at 06:37
Columns are already cached by ActiveRecord. You should only see repeated columns queries when running in development. In production each columns query is only called once.

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