Ruby on Rails multi select dropdown

Question

Firstly, I need to implement this HTML form in Rails, its a dropdown of languages that can be multi-selected. Secondly, what is the best approach to store the multiple languages selected by the user?

<div class="button-group">
  <label class="form-control" data-toggle="dropdown">Language <span class="fa fa-angle-down"></span> </label>
    <ul class="dropdown-menu2 dropdown-menu">
      <li>
        <a href="#" class="small" data-value="" tabIndex="-1"><input type="checkbox" /> No Other Language</a>
      </li>
      <li>
        <a href="#" class="small" data-value="arabic" tabIndex="-1"><input type="checkbox" /> Arabic</a>
      </li>
      <li>
        <a href="#" class="small" data-value="french" tabIndex="-1"><input type="checkbox" /> French</a>
      </li>
      <li>
        <a href="#" class="small" data-value="spanish" tabIndex="-1"><input type="checkbox" /> Spanish</a>
      </li>
  </ul>
</div>

Answer 1

• First to store the multiple values of the Users Languages, create a Language model that has a one-to-many relationship with the User model.

   class Language < ActiveRecord::Base belongs_to :user end 

• To store the options of the Languages you can create an enum in the Users model:

   class User < ActiveRecord::Base has_many :languages enum language: {:english=>1, :arabic=>2, :french=>3, :spanish=>4} end 

• And to add the multiselect in the form try (also a nice alternative is using check_box):

   <%= f.select :languages, {}, User.languages.each { |k, v| [k, v]}, :multiple => true %> 
   
  \n\n
   <% User.languages.each do |k, v|  %> <%= check_box :languages, k.humanize, value: v %> <%= label :languages, k.humanize %> <% end %>