Date instances logging support; fix for #105

lib/helpers.js

@@ -65,7 +65,7 @@ function makeObjectNonCircular(node, opt_parents) {
       continue;
     }
     let value = node[key];
-    if (typeof value === 'object' && !(value instanceof ObjectID)) {
+    if (typeof value === 'object' && !(value instanceof ObjectID) && !(value instanceof Date)) {
       if (opt_parents.indexOf(value) === -1) {
         copy[key] = makeObjectNonCircular(value, opt_parents);
       } else {

test/helpers-test.js

@@ -0,0 +1,22 @@
+/**
+ * @module 'helpers-test'
+ * @fileoverview Tests for winston-mongodb internal helpers methods
+ * @license MIT
+ * @author 0@39.yt (Yurij Mikhalevich)
+ */
+'use strict';
+const vows = require('vows');
+const assert = require('assert');
+const helpers = require('../lib/helpers');
+
+const originalData = {customDate: new Date()};
+
+vows.describe('winston-mongodb-helpers').addBatch({
+  'prepareMetaData': {
+    topic: helpers.prepareMetaData(originalData),
+    'should preserve Date instances': function(preparedData) {
+      assert.isTrue(preparedData.customDate instanceof Date);
+      assert.equal(+preparedData.customDate, +originalData.customDate);
+    }
+  }
+}).export(module);