merb1.1pre + bundler + dm-migration

[casret]

I can't seem to get this to work:

1) merb-gen a new app

2) gem bundle in the app

3) Create a migration (I use the one from the dm-migration example)

migration 1, :test  do

  up do

     create_table :people do

       column :id,   Integer, :serial => true

       column :name, String, :size => 50

       column :age,  Integer

     end

  end

  down do

    drop_table :people

  end

end

4) bin/rake db:migrate --trace

(relevant parts)

 == Performing Up Migration #1: test

rake aborted!

can't convert nil into Hash

/home/giao/git/giao/click_wrap/tmp/jmup/gems/gems/dm-migrations-0.10.1/lib/dm-migrations/sql/table_creator.rb:80:in `update'

I tried poking around in it, but it seems like the datamapper types aren't being required in or something.