Build rules and execute them in ruby. See https://jsonlogic.com

Install the gem and add to the application's Gemfile by executing:

$ bundle add json_logic

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install json_logic

RULE = <<~JSON
  { "and" : [
      {">=" : [ { "var" : "length" }, 15 ]},
      {">=" : [ { "var" : "size" }, 50 ]}
    ] }
JSON

DATA = JSON.parse('{ "length": 20, "size": 49 }')

logic = JsonLogic::Evaluator.new
logic.apply(JSON.parse(RULE), DATA)

logic = JsonLogic::Evaluator.new
res = logic.extract_vars(JSON.parse(RULE))
puts res

# will print -> ["length", "size"]

logic = JsonLogic::Evaluator.new
logic.apply(JSON.parse(RULE), DATA)

puts logic.tracker.report

# will print
# LOGIC: 'and', RESULT = false
#   DATA: 'length' data:20 >= expected:15,  RESULT = true
#   DATA: 'size' data:49 >= expected:50,  RESULT = false

After checking out the repo, run bin/setup to install dependencies. 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 the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/useful-libs/json-logic. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Json::Logic project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.