Fixes #400 - strip deeply nested $ prefixes when saving json

Author: katowulf

src/utils.js

@@ -277,7 +277,7 @@
             else {
               dat = {};
               utils.each(rec, function (v, k) {
-                dat[k] = v;
+                dat[k] = stripDollarPrefixedKeys(v);
               });
             }
             if( angular.isDefined(rec.$value) && Object.keys(dat).length === 0 && rec.$value !== null ) {
@@ -303,4 +303,15 @@
         return utils;
       }
     ]);
+
+    function stripDollarPrefixedKeys(data) {
+      if( !angular.isObject(data) ) { return data; }
+      var out = angular.isArray(data)? [] : {};
+      angular.forEach(data, function(v,k) {
+        if(typeof k !== 'string' || k.charAt(0) !== '$') {
+          out[k] = stripDollarPrefixedKeys(v);
+        }
+      });
+      return out;
+    }
 })();

tests/unit/utils.spec.js

@@ -108,6 +108,30 @@ describe('$firebaseUtils', function () {
       expect($utils.toJSON(json)).toEqual({foo: json.foo});
     });
 
+    it('should remove any deeply nested variables prefixed with $', function() {
+      var json = {
+        arr: [[
+            {$$hashKey: false, $key: 1, alpha: 'alpha', bravo: {$$private: '$$private', $key: '$key', bravo: 'bravo'}},
+            {$$hashKey: false, $key: 1, alpha: 'alpha', bravo: {$$private: '$$private', $key: '$key', bravo: 'bravo'}}
+
+        ], ["a", "b", {$$key: '$$key'}]],
+        obj: {
+          nest: {$$hashKey: false, $key: 1, alpha: 'alpha', bravo: {$$private: '$$private', $key: '$key', bravo: 'bravo'} }
+        }
+      };
+
+      expect($utils.toJSON(json)).toEqual({
+        arr: [[
+          {alpha: 'alpha', bravo: {bravo: 'bravo'}},
+          {alpha: 'alpha', bravo: {bravo: 'bravo'}}
+
+        ], ["a", "b", {}]],
+        obj: {
+          nest: {alpha: 'alpha', bravo: {bravo: 'bravo'} }
+        }
+      });
+    });
+
     it('should throw error if an invalid character in key', function() {
       expect(function() {
         $utils.toJSON({'foo.bar': 'foo.bar'});