Uses https://github.com/octopi/octopis-sinatra-on-heroku as a base.
This setup includes support for erb views and MongoDB. mongod must be running on port 27017 by default. Locally, the sample code connects to the test database with a testCollection and a users collection.
After you create a new Heroku app, a MongoLab account needs to be linked and the appropriate collections need to be set up.
The code here is meant to OAuth through to the Foursquare API, but some sections are incomplete. Can you fill them in?
You can find a gist of the completed sections. Note that these use the client ID and client secret of a specific app I created---you must supply your own.