Week of March 4-March 10, 2012

It was a fairly quiet week in Rails master.

Another piece of mass assignment protection shows up in c97a1666, which prevents the association builder from assigning unexpected foreign keys.
e4e13883 adds a :layout option for partials that render a collection. Take a look at 6e0a763d for example usage.
On the Guides front we're getting an instrumentation guide: see 4bfc8b1e.