index.js

import React from 'react';
import ReactDOM from 'react-dom';
import { Router, browserHistory } from 'react-router';
import routes from './routes';

ReactDOM.render(
  <Router history={browserHistory} routes={routes} />,
  document.querySelector('.container')
);

postsNew.js

import React, { Component, PropTypes } from 'react';

class PostsNew extends Component {
  static contextTypes = {
    router: PropTypes.object
  }
  
  /// ... template for a Post form
  
  onSubmit(props) {
    this.props.createPost(props)
      .then(() => {
        this.context.router.push('/');
      });
  }
}

routes.js

import React from 'react';
import { Route, IndexRoute } from 'react-router';
import App from './components/app';
import PostsIndex from './components/posts_index';
import PostsNew from './components/posts_new';
import PostsShow from './components/posts_show';

export default (
  <Route path='/' component={App}>
    <IndexRoute component={PostsIndex} />
    <Route path='posts/new' component={PostsNew} />
    <Route path='posts/:id' component={PostsShow} />
  </Route>
);