Apparently the new Rails 3 generators do not support looking up custom
generators in ~/.rails/generators anymore. Here is a bash function
that copies a generator from ~/.rails/generators/GENERATOR into
your rails app so that it can be used without having to turn it into a plugin /
gem.
Note that Rails 3 does not support older 2.x style generators so you have have to re-write those using the new Thor syntax. Here are some helpful links: