title: Activeadmin Batch actions button grayed out and check boxes not working
body: <p>I am kind of new to rails. I am setting up the activeadmin but on the record list for a model the batch actions and check boxes are having issues. Basically the batch actions button is grayed out and when I click the top check box to select/unselect all records it just checks that one box, all other boxes remain with the current state they have, making it not possible to apply any batch actions.</p>
  
  <p>I know that by default there is a delete batch action but with the button grayed out I cannot know.</p>
  
  <p>The solutions I've tried so far are:</p>
  
  <p>Add the <code>selectable_column</code> option on the <code>app/admin/model.rb</code></p>
  
  <pre><code>index do
    selectable_column
    column :name
    column :email
    column :create_date
    actions
  end
  </code></pre>
  
  <p>And add <code>#= require active_admin/base</code> to <code>active_admin.js.coffee</code></p>
  
  <p>None of these seem to work. I have seen other rails projects where this batch actions work by default from the beginning, but I cannot restart a new project because I am far to advanced on this one.</p>
  
  <p>If any further info is required to solve the issue please let me know.</p>
  
  <p>UPDATE</p>
  
  <p>I see that working projects of active admin have an <code>assets/active_admin.js</code> file, my project does not have it. I checked that under sources on the inspector of Chrome. I think that is the problem, but I do not know why it is not loading.</p>