fix(document): make nested doc keys not enumerable again

Fix #5078

Author: vkarpov15

lib/document.js

@@ -1767,25 +1767,44 @@ Document.prototype.$__dirty = function() {
  */
 
 function compile(tree, proto, prefix, options) {
-  var keys = Object.keys(tree),
-      i = keys.length,
-      limb,
-      key;
+  var keys = Object.keys(tree);
+  var i = keys.length;
+  var len = keys.length;
+  var limb;
+  var key;
 
-  while (i--) {
-    key = keys[i];
-    limb = tree[key];
-
-    defineKey(key,
-        ((utils.getFunctionName(limb.constructor) === 'Object'
-        && Object.keys(limb).length)
-        && (!limb[options.typeKey] || (options.typeKey === 'type' && limb.type.type))
-            ? limb
-            : null)
-        , proto
-        , prefix
-        , keys
-        , options);
+  if (options.retainKeyOrder) {
+    for (i = 0; i < len; ++i) {
+      key = keys[i];
+      limb = tree[key];
+
+      defineKey(key,
+          ((utils.getFunctionName(limb.constructor) === 'Object'
+          && Object.keys(limb).length)
+          && (!limb[options.typeKey] || (options.typeKey === 'type' && limb.type.type))
+              ? limb
+              : null)
+          , proto
+          , prefix
+          , keys
+          , options);
+    }
+  } else {
+    while (i--) {
+      key = keys[i];
+      limb = tree[key];
+
+      defineKey(key,
+          ((utils.getFunctionName(limb.constructor) === 'Object'
+          && Object.keys(limb).length)
+          && (!limb[options.typeKey] || (options.typeKey === 'type' && limb.type.type))
+              ? limb
+              : null)
+          , proto
+          , prefix
+          , keys
+          , options);
+    }
   }
 }
 
@@ -1796,7 +1815,7 @@ function getOwnPropertyDescriptors(object) {
 
   Object.getOwnPropertyNames(object).forEach(function(key) {
     result[key] = Object.getOwnPropertyDescriptor(object, key);
-    result[key].enumerable = true;
+    result[key].enumerable = ['isNew', '$__', 'errors', '_doc'].indexOf(key) === -1;
   });
 
   return result;
@@ -1844,7 +1863,7 @@ function defineKey(prop, subprops, prototype, prefix, keys, options) {
           }
 
           Object.defineProperty(nested, 'toObject', {
-            enumerable: true,
+            enumerable: false,
             configurable: true,
             writable: false,
             value: function() {
@@ -1853,7 +1872,7 @@ function defineKey(prop, subprops, prototype, prefix, keys, options) {
           });
 
           Object.defineProperty(nested, 'toJSON', {
-            enumerable: true,
+            enumerable: false,
             configurable: true,
             writable: false,
             value: function() {
@@ -1862,7 +1881,7 @@ function defineKey(prop, subprops, prototype, prefix, keys, options) {
           });
 
           Object.defineProperty(nested, '$__isNested', {
-            enumerable: true,
+            enumerable: false,
             configurable: true,
             writable: false,
             value: true

test/document.test.js

@@ -4037,6 +4037,33 @@ describe('document', function() {
       done();
     });
 
+    it('iterating through nested doc keys (gh-5078)', function(done) {
+      var schema = new Schema({
+        nested: {
+          test1: String,
+          test2: String
+        }
+      }, { retainKeyOrder: true });
+
+      schema.virtual('tests').get(function() {
+        return _.map(this.nested, function(v, key) {
+          return v;
+        })
+      });
+
+      var M = db.model('gh5078', schema);
+
+      var doc = new M({ nested: { test1: 'a', test2: 'b' } });
+
+      assert.deepEqual(doc.toObject({ virtuals: true }).tests, ['a', 'b']);
+
+      // Should not throw
+      require('util').inspect(doc);
+      JSON.stringify(doc);
+
+      done();
+    });
+
     it('JSON.stringify nested errors (gh-5208)', function(done) {
       var AdditionalContactSchema = new Schema({
         contactName: {