From: "Ball, Donald A Jr (Library)" <donald.ball@...>
Date: 2007-01-24T04:14:28+09:00
Subject: wrapping class method

Hey guys, I'm having trouble figuring out how to wrap a class method. I
want to add a logger.debug to ActiveRecord::Base.establish_connection,
just trying to figure out how the rails database connection lifecycle is
supposed to work. I tried this naive approach:

module ActiveRecord

  class Base

    alias self.old_establish_connection self.establish_connection

    def self.establish_connection(arg)
      logger.debug("Establishing connection")
      self.old_establish_connection(arg)
    end

  end

end

of course, ruby doesn't like this, the self.old_establish_connection bit
throws a SyntaxError. How ought I go about doing this?

- donald