I am using a YAML file for configuration in my rails app and a few entries in the file are subsets of future entries, eg -
domain: domain.com
name: jack
email: [email protected]
To make this more efficient, is something like this possible in YAML ?
domain: domain.com
name: jack
email: jack@${domain}
YAML has anchors, but you can't quite use them as variables the way you did in your question. You can get close with a post-processing step. Say your domains.yaml is
domains:
- domain: &domain domain.com
name: jack
emaillocal: jack
emaildomain: *domain
- domain: &domain thehill.com
name: Jill
emaillocal: jill
emaildomain: *domain
Then with
#! /usr/bin/ruby
require "yaml"
yaml = YAML.load_file('domains.yaml')
yaml['domains'].each { |d|
d['email'] = d['emaillocal'] + '@' + d['emaildomain']
}
puts YAML::dump(yaml)
you get
domains: - name: jack emaildomain: domain.com domain: domain.com emaillocal: jack email: [email protected] - name: Jill emaildomain: thehill.com domain: thehill.com emaillocal: jill email: [email protected]