DecisionMaker 
DecisionMaker is a library which behaves as a decision table and it makes complicated dispatching logic much simpler. See following usages for details.
Installation
Add this line to your application's Gemfile:
gem 'decision_maker'And then execute:
$ bundle
Or install it yourself as:
$ gem install decision_maker
Usage
Simple dynamic definition style.
require 'decision_maker'
ticket_price = DecisionMaker.generate do
rule(
child: { condition: 0..9, action: 600 },
student: { condition: 10..16, action: 1200 },
adult: { condition: ->(age) { age > 16 }, action: 2000 },
)
end
ticket_price.call(20) #=> 2000Class definition style.
require 'decision_maker'
TicketPrice = DecisionMaker.define do
rule(
child: { condition: 0..9, action: 600 },
student: { condition: 10..16, action: 1200 },
adult: { condition: ->(age) { age > 16 }, action: 2000 },
)
end
ticket_price = TicketPrice.new
ticket_price.call(20) #=> 2000Dynamic definition style with some name customizations.
require 'decision_maker'
ticket_price = DecisionMaker.generate do
name :calculate
condition_name :age
action_name :price
rule(
child: { age: 0..9, price: 600 },
student: { age: 10..16, price: 1200 },
adult: { age: ->(age) { age > 16 }, price: 2000 },
)
end
ticket_price.calculate(20) #=> 2000Development
After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/sunaot/decision_maker.
License
The gem is available as open source under the terms of the MIT License.