fix(document): handle dotted virtuals in toJSON output

Fix #5473

lib/document.js

@@ -9,6 +9,7 @@ var Schema = require('./schema');
 var ObjectExpectedError = require('./error/objectExpected');
 var StrictModeError = require('./error/strict');
 var ValidatorError = require('./schematype').ValidatorError;
+var VirtualType = require('./virtualtype');
 var utils = require('./utils');
 var clone = utils.clone;
 var isMongooseObject = utils.isMongooseObject;
@@ -948,9 +949,13 @@ Document.prototype.get = function(path, type) {
     adhoc = Schema.interpretAsType(path, type, this.schema.options);
   }
 
-  var schema = this.$__path(path) || this.schema.virtualpath(path),
-      pieces = path.split('.'),
-      obj = this._doc;
+  var schema = this.$__path(path) || this.schema.virtualpath(path);
+  var pieces = path.split('.');
+  var obj = this._doc;
+
+  if (schema instanceof VirtualType) {
+    return schema.applyGetters(null, this);
+  }
 
   for (var i = 0, l = pieces.length; i < l; i++) {
     obj = obj === null || obj === void 0
@@ -2328,6 +2333,7 @@ function applyGetters(self, json, type, options) {
   var schema = self.schema;
   var paths = Object.keys(schema[type]);
   var i = paths.length;
+  var numPaths = i;
   var path;
   var cur = self._doc;
   var v;
@@ -2336,6 +2342,26 @@ function applyGetters(self, json, type, options) {
     return json;
   }
 
+  if (type === 'virtuals') {
+    for (i = 0; i < numPaths; ++i) {
+      path = paths[i];
+      parts = path.split('.');
+      v = self.get(path);
+      if (v === void 0) {
+        continue;
+      }
+      plen = parts.length;
+      cur = json;
+      for (var j = 0; j < plen - 1; ++j) {
+        cur[parts[j]] = cur[parts[j]] || {};
+        cur = cur[parts[j]];
+      }
+      cur[parts[plen - 1]] = v;
+    }
+
+    return json;
+  }
+
   while (i--) {
     path = paths[i];