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Just wanted to point out the error in the footnote on page 184 by preview in Section 6.3:

This is based on http://www.therailsway.com/2007/3/26/association-proxies-are-your-friend. See that article as
well as AWDwR 2nd ed. (p. 312) for more information about create! vs. create and build! vs. build

should be

This is based on http://www.therailsway.com/2007/3/26/association-proxies-are-your-friend. See that article as
well as AWDwR 2nd ed. (p. 312) for more information about save! vs. save and build! vs. build