+ [feature] supports the enum/in can use object to transform value

index.js

@@ -66,6 +66,9 @@ Anchor.prototype.to = function (ruleset, context) {
 
 		if (rule === 'type') {
 
+      if (typeof ruleset['in'] === 'object' && ruleset['in'].hasOwnProperty(this.data)) {
+          this.data = ruleset['in'][this.data]
+      }
 			// Use deep match to descend into the collection and verify each item and/or key
 			// Stop at default maxDepth (50) to prevent infinite loops in self-associations
 			errors = errors.concat(Anchor.match.type.call(context, this.data, ruleset['type']));

lib/match/rules.js

@@ -5,6 +5,30 @@
 var _ = require('lodash');
 var validator = require('validator');
 
+//the validator author reject this PR, so override here:
+validator.isIn = function (str, options) {
+    var i ,result=false;
+    if (Object.prototype.toString.call(options) === '[object Array]') {
+        var array = [];
+        for (i in options) {
+            array[i] = validator.toString(options[i]);
+        }
+        result = array.indexOf(str) >= 0;
+    } else if (typeof options === 'object') {
+        if (options.hasOwnProperty(str)) {
+            result = true;
+        } else for (i in options) {
+            if (str == validator.toString(options[i])) {
+              result = true;
+              break;
+            }
+        }
+    } else if (options && typeof options.indexOf === 'function') {
+        result = options.indexOf(str) >= 0;
+    }
+    return result;
+};
+
 
 
 /**

test/basicType.test.js

@@ -83,6 +83,14 @@ describe('basic rules', function() {
 		it ('"number" should identify integers ', function () {
 			return testType('number',28235,'foo');
 		});
+
+		it ('"number" should support the enum(in) ', function () {
+			return testType({type: 'number', 'in': {one:1, two:2}},'one','foo', true);
+		});
+
+		it ('"number" should support the enum(in) and pass value directly', function () {
+			return testType({type: 'number', 'in': {one:1, two:2}}, 1, 'foo', true);
+		});
 	});
 
 });

test/util/testType.js

@@ -4,21 +4,19 @@ var async = require('async');
 
 // Test a rule given a deliberate example and nonexample
 // Test WITH and WITHOUT callback
-module.exports = function testType (rule, example, nonexample) {
+module.exports = function testType (rule, example, nonexample, isRule) {
 
 	// Throw an error if there's any trouble
 	// (not a good production usage pattern-- just here for testing)
 	var exampleOutcome, nonexampleOutcome;
 
+  if (isRule !== true)
+    rule = {type: rule};
 	// Should be falsy
-	exampleOutcome = anchor(example).to({
-		type: rule
-	});
+	exampleOutcome = anchor(example).to(rule);
 
 	// Should be an array
-	nonexampleOutcome = anchor(nonexample).to({
-		type: rule
-	});
+	nonexampleOutcome = anchor(nonexample).to(rule);
 
 	if (exampleOutcome) {
 		return gotErrors(exampleOutcome);