[chef] toggling yum repos to enabled, disabled

hi.

i'm trying to wield the yumrepo cookbook to control the yum repos i dist
to my systems. by default, the yum_repository resource from the yum
cookbook marks the repo as enabled. so it seems i should be able to
toggle that and make the repo disabled by default. but my attempts are
failing.

this is the yum_repository block from the yumrepo::epel recipe:

yum_repository "epel" do
  description "Extra Packages for Enterprise Linux"
  key node['repo']['epel']['key']
  url node['repo']['epel']['url']
  mirrorlist true
  action :add
end

above the action line i've tried adding 'enabled "0"' and 'enabled 0',
but the /etc/yum.repos.d/epel.repo shows up as "enabled=1".

how do i toggle repos as enabled or disabled?

thanks,
kallen