Feature(settings): Update url/challenge lang onChange

common/app/App.jsx

@@ -9,7 +9,8 @@ import {
   initWindowHeight,
   updateNavHeight,
   toggleMapDrawer,
-  toggleMainChat
+  toggleMainChat,
+  updateAppLang
 } from './redux/actions';
 
 import { submitChallenge } from './routes/challenges/redux/actions';
@@ -18,6 +19,16 @@ import Nav from './components/Nav';
 import Toasts from './toasts/Toasts.jsx';
 import { userSelector } from './redux/selectors';
 
+const bindableActions = {
+  initWindowHeight,
+  updateNavHeight,
+  fetchUser,
+  submitChallenge,
+  toggleMapDrawer,
+  toggleMainChat,
+  updateAppLang
+};
+
 const mapStateToProps = createSelector(
   userSelector,
   state => state.app.shouldShowSignIn,
@@ -43,15 +54,6 @@ const mapStateToProps = createSelector(
   })
 );
 
-const bindableActions = {
-  initWindowHeight,
-  updateNavHeight,
-  fetchUser,
-  submitChallenge,
-  toggleMapDrawer,
-  toggleMainChat
-};
-
 // export plain class for testing
 export class FreeCodeCamp extends React.Component {
   static displayName = 'FreeCodeCamp';
@@ -74,9 +76,16 @@ export class FreeCodeCamp extends React.Component {
     toggleMainChat: PropTypes.func,
     fetchUser: PropTypes.func,
     shouldShowSignIn: PropTypes.bool,
-    params: PropTypes.object
+    params: PropTypes.object,
+    updateAppLang: PropTypes.func.isRequired
   };
 
+  componentWillReceiveProps(nextProps) {
+    if (this.props.params.lang !== nextProps.params.lang) {
+      this.props.updateAppLang(nextProps.params.lang);
+    }
+  }
+
   componentDidMount() {
     this.props.initWindowHeight();
     if (!this.props.isSignedIn) {

common/app/redux/actions.js

@@ -40,6 +40,7 @@ export const updateUserLang = createAction(
   types.updateUserLang,
   (username, lang) => ({ username, lang })
 );
+export const updateAppLang = createAction(types.updateAppLang);
 // updateCompletedChallenges(username: String) => Action
 export const updateCompletedChallenges = createAction(
   types.updateCompletedChallenges

common/app/redux/reducer.js

@@ -25,6 +25,10 @@ export default handleActions(
       user,
       shouldShowSignIn: true
     }),
+    [types.updateAppLang]: (state, { payload = 'en' }) =>({
+      ...state,
+      lang: payload
+    }),
     [types.showSignIn]: state => ({
       ...state,
       shouldShowSignIn: true

common/app/redux/types.js

@@ -2,6 +2,7 @@ import createTypes from '../utils/create-types';
 
 export default createTypes([
   'updateTitle',
+  'updateAppLang',
 
   'fetchUser',
   'addUser',

common/app/routes/settings/components/Language-Settings.jsx

@@ -8,11 +8,11 @@ import { userSelector } from '../../../redux/selectors';
 import langs from '../../../../utils/supported-languages';
 
 const mapStateToProps = createSelector(
- userSelector,
- ({ user: { languageTag } }) => ({
-   // send null to prevent redux-form from initialize empty
-   initialValues: languageTag ? { lang: languageTag } : null
- })
+  userSelector,
+  ({ user: { languageTag } }) => ({
+    // send null to prevent redux-form from initialize empty
+    initialValues: languageTag ? { lang: languageTag } : null
+  })
 );
 const actions = { updateMyLang };
 const fields = [ 'lang' ];

common/app/routes/settings/redux/update-user-saga.js

@@ -1,14 +1,17 @@
 import { Observable } from 'rx';
+import { push } from 'react-router-redux';
 
 import { types } from './actions';
 import combineSagas from '../../../utils/combine-sagas';
 import { makeToast } from '../../../toasts/redux/actions';
+import { fetchChallenges } from '../../challenges/redux/actions';
 import {
   updateUserFlag,
   updateUserEmail,
   updateUserLang,
   doActionOnError
 } from '../../../redux/actions';
+import { userSelector } from '../../../redux/selectors';
 import { postJSON$ } from '../../../../utils/ajax-stream';
 import langs from '../../../../utils/supported-languages';
 
@@ -47,26 +50,33 @@ export function updateUserLangSaga(actions$, getState) {
     .filter(({ type, payload }) => (
       type === types.updateMyLang && !!langs[payload]
     ))
-    .map(({ payload }) => payload);
+    .map(({ payload }) => {
+      const state = getState();
+      const { user: { languageTag } } = userSelector(state);
+      return { lang: payload, oldLang: languageTag };
+    });
   const ajaxUpdate$ = updateLang$
-    .flatMap(lang => {
-      const {
-        app: { user: username, csrfToken: _csrf },
-        entities: { user: userMap }
-      } = getState();
-      const { languageTag: oldLang } = userMap[username] || {};
-      const body = {
-        _csrf,
-        lang
-      };
+    .debounce(250)
+    .flatMap(({ lang, oldLang }) => {
+      const { app: { user: username, csrfToken: _csrf } } = getState();
+      const body = { _csrf, lang };
       return postJSON$('/update-my-lang', body)
-        .map(({ message }) => makeToast({ message }))
+        .flatMap(({ message }) => {
+          return Observable.of(
+            // show user that we have updated their lang
+            makeToast({ message }),
+            // update url to reflect change
+            push(`/${lang}/settings`),
+            // refetch challenges in new language
+            fetchChallenges()
+          );
+        })
         .catch(doActionOnError(() => {
           return updateUserLang(username, oldLang);
         }));
     });
   const optimistic$ = updateLang$
-    .map(lang => {
+    .map(({ lang }) => {
       const { app: { user: username } } = getState();
       return updateUserLang(username, lang);
     });