JsonLogic

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

Installation

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

$ bundle add json_logic_ruby

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

$ gem install json_logic_ruby

Usage

Run 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)

Get all variables used in a rule

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

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

Track report of all operations

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

Development

After checking out the repo, run bundle install to install dependencies.

Contributing

Please see CONTRIBUTING.md.

License

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

Code of Conduct

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