Why does the markup on the page disappear when the kaminari-sinatra gem is included?

Y

yoh-asakura2017-07-04 09:30:44

Ruby on Rails

yoh-asakura, 2017-07-04 09:30:44

Why does the markup on the page disappear when the kaminari-sinatra gem is included?
app.rb

require 'bundler/setup'
Bundler.require

Mongoid.load!(File.expand_path('../mongodb.yml', __FILE__), :development)

configure do
  set :public_folder, 'public'
  register Kaminari::Helpers::SinatraHelpers
end

class Post
  include Mongoid::Document

  field :title, type: String
  field :description, type: String
end

get '/' do
  @posts = Post.page(params[:page]).per(5)
  erb :'posts/index'
end

gemfile

gem 'sinatra'
gem 'puma'
gem 'mongoid'
gem 'kaminari-sinatra'
gem 'kaminari-mongoid'

index.erb

<h1>All posts</h1>

<% @posts.each do |post| %>
  Title: <%= post.title %><br>
  Description: <%= post.description %><br>
<% end %>

<%= paginate @posts %>

layout.erb

<html>
  <head>
    <title>Home page</title>
    <link rel="stylesheet" href="/stylesheets/foundation.min.css">
  </head>

  <body>
    <div class="grid-container">
        <div class="grid-x">
            <div class="cell">
              <div class="top-bar">
                  <div class="top-bar-left">
                    <ul class="dropdown menu" data-dropdown-menu>
                      <li><a href="/">Home</a></li>
                    </ul>
                  </div>
                </div>
            </div>
        </div>

        <div class="grid-x">
            <div class="cell"><%= yield %></div>
        </div>
    </div>
  </body>
</html>