The rake tasks in /etc/cron.d/foreman should use bundle exec.

--- etc/cron.d/foreman 2013-02-05 22:31:45.000000000 0100
++ etc/cron.d/foreman.bundle 2013-02-11 19:07:15.147455681 +0100
@ -5,21 +5,21 @
FOREMAN_HOME=/usr/share/foreman

1. Clean up the session entries in the database
   -15 23 * * * foreman cd ${FOREMAN_HOME} && /usr/bin/rake db:sessions:clear
   +15 23 * * * foreman cd ${FOREMAN_HOME} && bundle exec /usr/bin/rake db:sessions:clear

1. Send out daily summary
   -0 7 * * * foreman cd ${FOREMAN_HOME} && /usr/bin/rake reports:summarize
   +0 7 * * * foreman cd ${FOREMAN_HOME} && bundle exec /usr/bin/rake reports:summarize

1. Expire old reports
   -30 7 * * * foreman cd ${FOREMAN_HOME} && /usr/bin/rake reports:expire
   +30 7 * * * foreman cd ${FOREMAN_HOME} && bundle exec /usr/bin/rake reports:expire

1. Collects trends data
   -/30 * * * * foreman cd ${FOREMAN_HOME} && /usr/bin/rake trends:counter
   +/30 * * * * foreman cd ${FOREMAN_HOME} && bundle exec /usr/bin/rake trends:counter

1. Only use the following cronjob if you're using stored configs!
2. Populate hosts
   -/30 * * * * foreman cd ${FOREMAN_HOME} && /usr/bin/rake puppet:migrate:populate_hosts
   +/30 * * * * foreman cd ${FOREMAN_HOME} && bundle exec /usr/bin/rake puppet:migrate:populate_hosts

1. Only uncomment the following cronjob if you're not using stored configs!
   ---EOF---