LightRulesEngine

Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file lib/light_rules_engine. To experiment with that code, run bin/console for an interactive prompt.

TODO: Delete this and the text above, and describe your gem

Installation

Add this line to your application's Gemfile:

gem 'light_rules_engine'

And then execute:

$ bundle

Or install it yourself as:

$ gem install light_rules_engine

Usage

Concept of light rule engine

When we need to have some kind of dynamic rules which we want to apply based on some conditions this can be a solution.

• Rule it is place holder for business decisions and conditions when we can apply them

So Rule:

    class BookingRule < LightRulesEngine::BaseRule
    end

    booking = double('booking', kind: 'Hotel', room: 'single', pax: 4, items: { bed: 'double', see_view: true, windows_count: 4 })

    data_container = DataContainerBuilder.build(booking, name: :booking)
    conditions     ={
      kind: :operator,
      type: :all,
      values: [
        {
          kind: :operator,
          type: :eq,
          values: [
            { kind: :data, type: 'booking.kind' },
            { kind: :value, type: :string, value: 'Hotel'}
          ]
        },
        {
          kind: :operator,
          type: :gt,
          values: [
            { kind: :data, type: 'booking.pax' },
            { kind: :value, type: :integer, value: 2 }
          ]
        },   
        {
          kind: :operator,
          type: :any,
          values: [
            {
              kind: :operator,
              type: :eq,
              values: [
                { kind: :const, type: 'DOUBLE_BED' },
                { kind: :data, type: 'booking.items[:bed]' }
              ]
            },
            {
              kind: :operator,
              type: :range,
              values: [
                { kind: :value, type: 'integer', value: 3 },
                { kind: :value, type: 'integer', value: 12 },
                { kind: :data, type: 'booking.items[:windows_count]' }
              ]
            }
          ]
        }
      ]
    }
    rule = BookingRule.new(source: business_source_logic, conditions: conditions)

    # true / false
    LightRulesEngine.applicable_conditions?(data_container, conditions)

    # list of rules which are valid
    LightRulesEngine.rules_applicable?(data_container, rule)

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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/[USERNAME]/light_rules_engine. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.