Question

I’ve uploaded a simple Ruby test application to Cloud Foundry that works on my machine™, but it gives the following error on the site.

====> logs/stderr.log <====

/var/vcap/data/packages/dea_ruby18/3.1/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require': no such file to load -- mongo_mapper (LoadError)
    from /var/vcap/data/packages/dea_ruby18/3.1/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from recall.rb:2

I noticed that you need to have a Gemfile which is present in my root directory, but I’m not sure if it’s getting used by the server.

source "http://rubygems.org"
gem "mongo_mapper"
gem "bson_ext"

So I’m guessing there are two possible reasons why this isn’t working:

1. I’m running Ruby 1.9, Cloud Foundry has 1.8 and there is something different? (I tried adding the ‘require ‘rubygems” line to my file but no difference)
2. My Gemfile is in the wrong format (or there is some other additional requirement for specifying where to get the mongo_mapper gem from).

How can this problem be solved?

Answer 1

I, like you, had trouble requiring ‘mongo_mapper’ on cloudfoundry. I solved my problems using Bundler and a Gemfile, as this page at cloudfoundry tells us to.

I now have “bundler” gem installed locally, and added this Gemfile at the root of the app tree:

source "http://rubygems.org"
gem 'sinatra'
gem 'json'
gem 'mongo'
gem 'mongo_mapper'

and instead of having the require lines in the .rb file, I only have this:

Bundler.require

before doing vmc push or update, you need to execute this:

bundle package
bundle install

I also did a little blog post about it.