Following on from my last post for getting PostgreSQL up and running nicely on Mac OS X, my next task was getting it playing nicely with ruby on rails - I’m off on a rails course next week so I’m getting stuff ready. 
It appears that there is currently two/three gem packages for using postgresql with ruby: postgres, ruby-pg, and pg - and from what I can make out, they’re all maintained by the same team now, (postgres was the original package, but it got abandoned - ruby-pg and pg are the replacements). As such, i’ll go with the newer ruby-pg gem…
sudo env ARCHFLAGS="-arch i386" gem install \ ruby-pg -- \ --with-pgsql-lib=/opt/local/lib/postgresql83 \ --with-pgsql-include=/opt/local/include/postgresql83
Then finally, when writing the database.yml entry for connecting to postgresql, we have to define our adapter as follows:
development: adapter: postgresql database: test_dev encoding: unicode host: localhost user: XXXXX password: XXXXX timeout: 5000
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