fix(utils): flattenObject for null values (#10293)

lib/utils.js

@@ -399,8 +399,8 @@ function flattenObjectDeep(value) {
   function flattenObject(obj, subPath) {
     Object.keys(obj).forEach(key => {
       const pathToProperty = subPath ? `${subPath}.${key}` : key;
-      if (typeof obj[key] === 'object') {
-        flattenObject(obj[key], flattenedObj, pathToProperty);
+      if (typeof obj[key] === 'object' && obj[key] !== null) {
+        flattenObject(obj[key], pathToProperty);
       } else {
         flattenedObj[pathToProperty] = _.get(obj, key);
       }

test/integration/utils.test.js

@@ -212,4 +212,34 @@ describe(Support.getTestDialectTeaser('Utils'), () => {
       });
     }
   });
+
+  describe('flattenObjectDeep', () => {
+    it('should return the value if it is not an object', () => {
+      const value = 'non-object';
+      const returnedValue = Utils.flattenObjectDeep(value);
+      expect(returnedValue).to.equal(value);
+    });
+
+    it('should return correctly if values are null', () => {
+      const value = {
+        name: 'John',
+        address: {
+          street: 'Fake St. 123',
+          city: null,
+          coordinates: {
+            longitude: 55.6779627,
+            latitude: 12.5964313
+          }
+        }
+      };
+      const returnedValue = Utils.flattenObjectDeep(value);
+      expect(returnedValue).to.deep.equal({
+        name: 'John',
+        'address.street': 'Fake St. 123',
+        'address.city': null,
+        'address.coordinates.longitude': 55.6779627,
+        'address.coordinates.latitude': 12.5964313
+      });
+    });
+  });
 });