Trying to figure out proper environment and cookbook attribute syntax for Chef

lehrblogger

# In my environment json file:
  "default_attributes": {
    "source_dir": "/vagrant/source_dir"
  },
# When I look in the list of attributes at https://manage.opscode.com/nodes/[node_name],
# I see the 'source_dir' attribute, so far so good.

# Then, in my cookbook's default.rb attributes file:
default['mycookbook']['dir'] = "#{default[:source_dir].to_s}/mycookbook"

# And then run a provision, it seems happy, but then looking back at 
# https://manage.opscode.com/nodes/[node_name], I see the mycookbook attribute as a hash,
# but the 'dir' attribute has a value of "#<Chef::Node::Attribute:0x0000000295d088>/mycookbook",
# rather than "/vagrant/source_dir/mycookbook".