retrospring/app/views/inbox/show.js.erb

$('#entries').append('<% @inbox.each do |i|
  %><%= j render 'inbox/entry', i: i
%><% end %>');
<% if @inbox.next_page %>
$('#pagination').html('<%= j will_paginate @inbox, renderer: BootstrapPagination::Rails, page_links: false %>');
<% else %>
$('#pagination, #load-more-btn').remove();
<% end %>
<% Inbox.where(id: @inbox.pluck(:id)).update_all(new: false) %>