Adding to database without refreshing the page? - ruby-on-rails

Question

When I add a model in my index action, the create action is invoked that adds an instance of the model to the database. This is the following create action:
tracks_controller.rb
def create
#track = Track.new(params[:track])
if #track.save
redirect_to(root_url) //Want to change this!
else
#tracks = Track.all
render :action=>"index"
end
end
Where you can see that I am redirected to my root url (where I want to be) everytime create is invoked. However, how can I carry this out without refreshing the page? Since tracks are being played, I do not want the page to be refreshed whenever something is added to the database.
If I change this line to render :action=>"index", then I receive the following error in my index.html.erb file
undefined methodeach' for nil:NilClass`
15: <p>Database is empty!</p>
16: <%else%>
17: <br>
18: <% #tracks.each do |track| %>
19: <div id="list_container">
20: <ul>
21: <li class="list_container">
How do I go about achieving this?

Answer 1

form
<%= form_for #track, remote: true %>
form fields
<%= f.submit %>
<% end %>
app/views/tracks/create.js.erb
<% if #track.valid? %>
  $(".tracks").prepend('<%= j(render(#track)) %>'); // make sure you have _track.html.erb
$("ID OR CLASS OF YOUR FORM")[0].reset(); // this will clear your form inputs
<% else %>
alert('Something Went Wrong');
<% end %>
app/views/tracks/index.html.erb
<div class="tracks">
<% #tracks.each do |track| %>
<%= render :partial => 'track' %>
<% end %>
</div>
app/views/tracks/_track.html.erb
some code here to show track:
<div>track.id</div>
<div>track.name</div>

Answer 2

index.html.erb needs the #tracks variable. Therefore, you have to set it before rendering the page.
For example:
def create
#track = Track.create(params[:track])
#tracks = Track.all
render :action => "index"
end

Answer 3

The simplest, quickest way to get it is to add :remote => true to you form_for!

Answer 4

If you are posting track from a form then make the remote to true
like
<%=form_for #track, :remote => true do |f| %>
your input fields
<%end %>
index.html.erb
<div id="track_list">
<%= render :partial => 'tracks_record' %>
</div>
_tracks_record.html.erb
<% #tracks.each do |track|%>
your code
<% end %>
in controller
def create
#track = Track.create(params[:track])
#tracks = Track.all
respond_to do |format|
format.js
end
end
Create one js.erb file for create.js.erb
<% if #track.valid? %>
('#track_list').html('<%= escape_javascript( render :partial => "tracks_record" ) %>');
<% else %>
alert('Could not save');
<% end %>
This will refresh the data and populate the new entries without refreshing the page.

Answer 5

Unfortunately I can't comment on Debadatt's suggestion but I found it much better than the top post. My only notes are to change this to
def create
#track = Track.create(params[:track])
#tracks = Track.all
respond_to do |format|
format.js
end
end
to this:
def create
#track = Track.create(params[:track])
#tracks = Track.all
respond_to do |format|
format.js { render layout: false, content_type: 'text/javascript' }
end
end
And this:
('#track_list').html('<%= escape_javascript( render :partial => "tracks_record" ) %>');
to this:
$('#track_list').html('<%= escape_javascript( render :partial => "tracks_record" ) %>');
Great suggestion thanks Debadatt