query-builder-to-string

var RuleEngine = require("node-rules"); var RuleConverter = require("query-builder-to-string"); var ruleInput = { "condition": "AND", "rules": [{ "id": "price", "field": "price", "type": "double", "input": "number", "operator": "less", "value": 10.25 }, { "condition": "OR", "rules": [{ "id": "category", "field": "category", "type": "integer", "input": "select", "operator": "equal", "value": 2 }, { "id": "category", "field": "category", "type": "integer", "input": "select", "operator": "equal", "value": 1 }, { "condition": "AND", "rules": [{ "id": "in_stock", "field": "in_stock", "type": "integer", "input": "radio", "operator": "equal", "value": 1 }] } ] } ], "valid": true }; var output = RuleConverter(ruleInput); /* Creating Rule Engine instance */ var R = new RuleEngine(); /* Add a rule */ var rule = { "condition": function (R) { R.when(eval(output)); }, "consequence": function (R) { this.result = false; this.reason = "The transaction was blocked as it was less than 10"; R.stop(); } }; /* Register Rule */ R.register(rule); /* Add a Fact with less than 10 as transaction, and this should be blocked */ var fact = { "price": "5", "category": 2 }; /* Check if the engine blocks it! */ R.execute(fact, function (data) { if (data.result) { console.log("Valid transaction"); } else { console.log("Blocked Reason:" + data.reason); } });