[Rails] Create an evaluation function using raty.js

It is a method to implement the evaluation function with a star image in the rails application using raty.js. You need jquery.

environment

$ rails -v
Rails 5.2.4.4

Introduced jquery

Gemfile

gem 'jquery-rails'

$ bundle install

app/assets/javascripts/application.js

//= require jquery

Create jquery.raty.js

$ touch app/assets/javascripts/jquery.raty.js

Copy and paste the description in https://github.com/wbotelhos/raty/blob/master/lib/jquery.raty.js to the created file. Then require in application.js (write after jquery)

app/assets/javascripts/application.js

//= require jquery.raty.js

Place the image of the star

Download star-on.png, star-off.png, star-half.png from https://github.com/wbotelhos/raty/tree/master/lib/images and app Placed under/assets/images.

Create data with columns to store evaluations

$ rails g migration addEvaluationToMovie evaluation:float

db/migrate/202101011111.rb

class AddEvaluationToMovie < ActiveRecord::Migration[5.2]
  def change
    add_column :movies, :evaluation, :float
  end
end

$ rails db:migrate

Create evaluation posting screen

This time, as an example, let's make it possible to post the evaluation together on the screen for posting the title of your favorite movie.

erb:app/views/movies/new.html.erb

<h2>Post your favorite movie</h2>
<%= form_with(model: movie, local: true) do |form| %>
  <div>
    <%= form.label :title %>
    <%= form.text_field :title %>
  </div>
  <div id="evaluate_stars">
    <label>Evaluation</label>
  </div>
  <div class="actions">
    <%= form.submit %>
  </div>
<% end %>
<script>
  $('#evaluate_stars').raty({
    starOn: "<%= asset_path('star-on.png') %>",
    starOff: "<%= asset_path('star-off.png') %>",
    starHalf: "<%= asset_path('star-half.png') %>",
    scoreName: 'movie[evaluation]' //Describe the model name and column name to be registered
  });
</script>

app/controllers/movies_controller.rb

def movie_params
  params.require(:movie).permit(:title, :evaluation) #Added evaluation
end

View posted ratings

Here, as an example, the evaluation is displayed on the index page.

erb:app/views/movies/index.html.erb

<h1>Movie list</h1>
<table>
  <thead>
    <tr>
      <th>title</th>
      <th>Evaluation</th>
    </tr>
  </thead>
  <tbody>
    <% @movies.each do |movie| %>
      <tr>
        <td><%= movie.title %></td>
        <td class="movie-evaluation" data-score="<%= movie.evaluation %>"></td>
      </tr>
    <% end %>
  </tbody>
</table>
<script>
  $('.movie-evaluation').raty({
    readOnly: true,
    score: function() {
      return $(this).attr('data-score');
    },
    path: '/assets/'
  });
</script>

reference

• jQuery Raty - A Star Rating Plugin
• wbotelhos/raty: :star2: Raty - A Star Rating Plugin -Jquery.raty rails introduced --Qiita