Fixing rogue "cannot read value of undefined" issue.

Author: davidkpiano

src/reducers/form/change-action-reducer.js

@@ -65,7 +65,10 @@ function updateFieldValue(field, action) {
     const subField = field[index] || createInitialState(`${model}.${index}`, subValue);
 
     if (Object.hasOwnProperty.call(subField, '$form')) {
-      return updateFieldValue(subField, subValue);
+      return updateFieldValue(subField, {
+        model: index,
+        value: subValue,
+      });
     }
 
     if (shallowEqual(subValue, subField.value)) {

src/reducers/form/reset-action-reducer.js

@@ -1,5 +1,6 @@
 import actionTypes from '../../action-types';
 import updateField from '../../utils/update-field';
+import mapValues from '../../utils/map-values';
 import initialFieldState from '../../constants/initial-field-state';
 import i from 'icepick';
 
@@ -9,8 +10,11 @@ export default function resetActionReducer(state, action, localPath) {
     return state;
   }
 
-  const resetFieldState = (field) =>
-    i.set(initialFieldState, 'value', field.initialValue);
+  const resetFieldState = (field) => {
+    if (field.$form) return mapValues(field, resetFieldState);
+
+    return i.set(initialFieldState, 'value', field.initialValue);
+  };
 
   return updateField(state, localPath, resetFieldState, resetFieldState);
 }