It provides scoped view to a hash (mash) data structure. When the requested scope does not exist, it would fall back to the non-scope key.
require 'scoped_hash'
smash = ScopedHash.new( 'tax': { min: 20, max: 40},
'tax(democratic)': { min: 30, max: 50},
'tax(republican)': { min: 10, max: 30})
smash.scope('democratic')[:tax][:min] == 30
smash.scope('republican')[:tax][:min] == 10
smash.scope('green')[:tax][:min] == 20The best practice of this library is to create a YAML configuration file with scope annotation, for example the "config.yaml" could be:
tax:
min: 20
max: 40
max(green): 60
tax(democratic):
min: 30
max: 50
tax(republican):
min: 10
max: 30And the scoped access to the configuration could be as following:
require 'yaml'
require 'scoped_hash'
config = ScopedHash.new(YAML.load_file('config.yml'))
config.scope('democratic')[:tax][:min] == 30
config.scope('republican')[:tax][:min] == 10
config.scope('green')[:tax][:min] == 20
config[:tax][:max] == 40
config.scope('green')[:tax][:max] == 60Simply use gem to install this library:
gem install scoped_hash
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