Develop a Rails object using AJAX and JavaScript

Within a music application built on Rails, I am attempting to monitor plays for tracks by artists. This involves creating a unique play object each time a visitor plays a track on the site. These play objects are assigned their own distinct IDs and are associated with specific tracks.

The functionality for creating these play instances is currently set up in the plays_controller.rb file within the API. However, I am encountering challenges in connecting this setup to the play buttons displayed on the page to ensure that playing a track triggers the creation of a new play object linked to that particular track.

Users have the ability to play tracks utilizing buttons structured like the following:

<% @top_tracks.each do |track| %>
  <button class="track-play track-<%= track.id %>-play" onclick="playTrack(<%= track.to_json %>)">
    <i class="icon-play"></i>
  </button>
  ...
  [information about the track, such as <%= track.title %>]
  ...
<% end %>

Displayed below are relevant segments from the routes.rb file to pinpoint the location of the plays_controller.rb in the API:

namespace :api, defaults: {format: 'json'} do
  namespace :v1 do
    resources :plays, only: [:index, :create]
  end
end

The snippet featured here illustrates key elements from the plays_controller.rb file:

def create
  @play = Play.create!(play_params)
  render(:json => {}, :status => :created)
end

private
def play_params
  params.require(:play).permit(:track_id)
end

In addition, we highlight essential portions from the corresponding Javascript:

var player = document.getElementById('audio');

window.playTrack = function (track) {
    player.setAttribute('src', track.file_url);
    player.play();

    var trackId = track.id;
};

I am struggling with implementing AJAX properly to generate a fresh play object. As an attempt, I integrated the following code into the `playTrack` function within the JavaScript mentioned above:

$.ajax({
  type: "POST",
  url: '/api/v1/plays',
  data: { track_id: trackId }
})

Regrettably, this method did not yield the desired outcome and resulted in an error message stating "param not found: play" (seemingly originating from the `play_params` in the `plays_controller.rb` Create action).

I would greatly appreciate any guidance or assistance in resolving this issue and ensuring its successful implementation.

Answer №1

When working with Rails, it is important to have nested params. For example, if you want to pass the track_id within a play object, the parameter should be named play[track_id]. One way to achieve this is by including a play object in your AJAX data, as shown below:

$.ajax({
  type: "POST",
  url: '/api/v1/plays',
  data: { play: { track_id: trackId } }
})

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