Mongoid 3 + Heroku (MongoHQ) cause Moped::Errors::OperationFailure
You will need to use Ruby 1.9.3. See Mongoid documentation here and Heroku documentation here on how to use 1.9.3. I was also getting similar errors, and I changed my gemfile to include ruby ‘1.9.3’ and everything worked as expected again. Edit: @herb pointed out that you need the latest version of bundler for this … Read more