allow for infinite field nesting on return object

src/createBaseForm.js

@@ -6,6 +6,7 @@ import {
   isEmptyObject, flattenArray,
   getNameKeyObj, getNameKeyStr,
   flatFieldNames, clearVirtualField,
+  setObject,
 } from './utils';
 import AsyncValidator from 'async-validator';
 import warning from 'warning';
@@ -333,8 +334,7 @@ function createBaseForm(option = {}, mixins = []) {
             if (fieldsMeta.hasOwnProperty(fieldKey)) {
               const nameKeyObj = getNameKeyObj(fieldKey);
               if (nameKeyObj.name === name && nameKeyObj.key) {
-                ret[nameKeyObj.key] =
-                  this.getValueFromFieldsInternal(fieldKey, fields);
+                setObject(nameKeyObj.key, this.getValueFromFieldsInternal(fieldKey, fields), ret)
               }
             }
           }

src/utils.js

@@ -110,6 +110,16 @@ export function getNameKeyObj(str) {
   };
 }
 
+export function setObject(str, value, context) {
+  var parts = str.split(NAME_KEY_SEP),
+  p = parts.pop();
+  // if object && string has another part && we've looped less than 100 times
+  for(var i=0, j; context && (j=parts[i]) && i<100; i++){
+    context = (j in context ? context[j] : context[j]={});
+  }
+  return context && p ? (context[p]=value) : undefined; // Object
+}
+
 export function flatFields(fields_, fieldsMeta) {
   const fields = { ...fields_ };
   Object.keys(fields).forEach((k) => {