Enabling hstore for new postgresql 9.1 and rails 3 install on ubuntu 12.04

gistfile1.sh

RAILS_ENV=production rake db:setup
# produces the error below.....hmmm.....it's a no-worky
psql:/yourprojectpath/yourproject/db/structure.sql:29: ERROR:  could not open extension control file "/usr/share/postgresql/9.1/extension/hstore.control": No such file or directory

# hstore postgresql extension needs to be installed, so....
sudo apt-get install postgresql-contrib-9.1

# now your extension should be available to enable so log in with psql
psql -d yourproject_production -U yourdbuser -W

# in the psql shell
CREATE EXTENSION hstore;
\q

# now you're golden, may need to clean up and re-run
RAILS_ENV=production rake db:drop
RAILS_ENV=production rake db:setup