fix(file): add #_toPointer

fixes #542

Author: leeyeh

src/file.js

@@ -248,6 +248,18 @@ module.exports = function(AV) {
         return this._toFullJSON(seenObjects, false);
       },
 
+      /**
+       * Gets a Pointer referencing this file.
+       * @private
+       */
+      _toPointer() {
+        return {
+          __type: 'Pointer',
+          className: this.className,
+          objectId: this.id,
+        };
+      },
+
       /**
        * Returns the ACL for this file.
        * @returns {AV.ACL} An instance of AV.ACL.

src/object.js

@@ -7,14 +7,13 @@ const {
   transformFetchOptions,
   setValue,
   findValue,
+  isPlainObject,
 } = require('./utils');
 
 const recursiveToPointer = value => {
   if (_.isArray(value)) return value.map(recursiveToPointer);
-  if (_.isObject(value)) {
-    if (value._toPointer) return value._toPointer();
-    return _.mapObject(value, recursiveToPointer);
-  }
+  if (isPlainObject(value)) return _.mapObject(value, recursiveToPointer);
+  if (_.isObject(value) && value._toPointer) return value._toPointer();
   return value;
 };
 

src/utils/index.js

@@ -221,6 +221,9 @@ const findValue = (target, key) => {
   return [value, currentTarget, lastSeg, firstSeg];
 };
 
+const isPlainObject = obj =>
+  _.isObject(obj) && Object.getPrototypeOf(obj) === Object.prototype;
+
 module.exports = {
   ajax,
   isNullOrUndefined,
@@ -232,4 +235,5 @@ module.exports = {
   parseDate,
   setValue,
   findValue,
+  isPlainObject,
 };