[Rails] How to update feed using ajax in Rails 4.0

[nilay singh]

I am trying to create an ajax functionality for a sample app of michael 
heart book . I created a feed model controller which is micropost in hear 
book . I am trying to use ajax like post feed method . But I am getting 
some error . I am attaching my code below take a look and help me .

 feeds_controller.erbclass FeedsController < ApplicationController

        before_action :authenticate_user! ,only: [:create, :destroy]
    def create
        @feed = current_user.feeds.build(feed_params)
        if @feed.save
           flash[:success] = "Micropost created!"
          #redirect_to root_url
          respond_to do |format|

          format.html { redirect_to root_url }
          format.js
        end
        else
          @feed_items = []
          render 'static_pages/home'
        end
      end

      def destroy
      end

      private

        def feed_params
          params.require(:feed).permit(:content)
        end
    end

And my home page is rendering some partials Here is the code :

static_pages/home.html.erb


<% if user_signed_in? %>
        <div class="row">
          <aside class="col-md-4">
            <section class="user_info">
              <%= render 'shared/user_info' %>
            </section>
             <section class="stats">
              <%= render 'shared/stats' %>
            </section>

          </aside>
          <div class="col-md-8">
            <h3>Micropost Feed</h3>
            <section class="micropost_form">
              <%= render 'shared/feed_form' %>
            </section>
            <%= render 'shared/feed' %>
          </div>
        </div>
      <% else %>

      <% end %>

Here are two codes Everything work perfectly but when I am trying to add ajax I 
get the error which is :

  Rendered shared/_feed.html.erb (3.1ms)

              Rendered feeds/create.js.erb (6.0ms)
            Completed 500 Internal Server Error in 73ms (ActiveRecord: 44.4ms)

            NoMethodError (undefined method `any?' for nil:NilClass):
              app/views/shared/_feed.html.erb:1:in 
`_app_views_shared__feed_html_erb___516512175__638262078'
              app/views/feeds/create.js.erb:1:in 
`_app_views_feeds_create_js_erb___967625174__637838198'
              app/controllers/feeds_controller.rb:9:in `create'


To execute ajax on create method I added these files unders feeds views file 
name is create.js.erb

$("#feed_add").html("<%= escape_javascript(render partial: "shared/feed") %>");


And form file is under shared view file with name _feed_form.html.erb


  <%= form_for(@feed,:remote  => true) do |f|  %>


          <div id="feed_add">
            <%= f.text_area :content, placeholder: "Compose new            
feed..." %>
          </div>
          <%= f.submit "Post", class: "btn btn-primary" %>
        <% end %>


_feed.html.erb

<% if @feed_items.any? %>

   <ol class="microposts">
   <%= render @feed_items %>
   </ol>
   <%= will_paginate @feed_items %>
   <% end %>


So tell me how can I add feed and without refreshing how can I show feed using 
partial In this code 

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