Heroku的Facebook画布应用教程:誓言错误

Question

我正在复制并粘贴Heroku教程中关于构建一个画布应用程序以在Heroku上托管的代码。https://devcenter.heroku.com/articles/facebook-ruby，但是，我得到了这个错误，回溯(见下面)说是与杂食相关的。

有人能解释一下吗

NoMethodError at /
undefined method `include?' for nil:NilClass
file: builder.rb location: call line: 29

这些是它使用的宝石

gem 'sinatra', '1.0'
gem 'oa-oauth', '0.1.6'



BACKTRACE
(condense)
JUMP TO: GET POST COOKIES ENV
/Users/michael/.rvm/gems/ruby-1.9.3-rc1@ruby193/gems/oa-core-0.1.6/lib/omniauth/builder.rb in call
      @ins << @app unless @ins.include?(@app)
/Users/michael/.rvm/gems/ruby-1.9.3-rc1@ruby193/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb in call
        status, headers, body = @app.call(env)
/Users/michael/.rvm/gems/ruby-1.9.3-rc1@ruby193/gems/rack-protection-1.2.0/lib/rack/protection/base.rb in call
        result or app.call(env)
/Users/michael/.rvm/gems/ruby-1.9.3-rc1@ruby193/gems/rack-protection-1.2.0/lib/rack/protection/base.rb in call
        result or app.call(env)
/Users/michael/.rvm/gems/ruby-1.9.3-rc1@ruby193/gems/rack-protection-1.2.0/lib/rack/protection/path_traversal.rb in call

主代码

index.erb

<%=session['fb_error']%>

<% if session['fb_auth'] %>
  <a href='logout'><img src='images/fb_logout_button.png'></a>
<% else %>
  <a href='auth/facebook'><img src='images/fb_login_button.png'></a>
<% end %>

<h3><%= 'Hello, ' + session['fb_auth']['user_info']['first_name'] + ', ' if session['fb_token'] %>Welcome to my list of interesting articles.</h3>

<table>
  <% @articles.each do |article| %>
  <tr>
    <td class='article'>- <a href='<%=article[:url]%>' target='_blank'><%=article[:title]%></a></td>
    <td>
      <% if session['fb_auth'] %>
        <iframe src="http://www.facebook.com/plugins/like.php?href=<%=article[:url]%>&amp;layout=button_count&amp;show_faces=true&amp;width=450&amp;action=like&amp;colorscheme=light&amp;height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:21px;" allowTransparency="true"></iframe>
      <% end %>
    </td>
  </tr>
  <% end %>
</table>

<% if session['fb_auth'] %>
  <hr />
  <p><span class='like_site'>Do you like this site?</span></p>
  <p><iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Ffaceboku.heroku.com%2F&amp;layout=standard&amp;show_faces=true&amp;width=450&amp;action=like&amp;colorscheme=light&amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:80px;" allowTransparency="true"></iframe></p>
<% end %>

Faceboku.rb

equire 'sinatra'
require 'omniauth/oauth'

enable :sessions


#Here you have to put your own Application ID and Secret
APP_ID = "495940167082961"
APP_SECRET = "686da25c0fdd04a6f61b287bb0d5c9aa"

use OmniAuth::Builder do
  provider :facebook, APP_ID, APP_SECRET, { :scope => 'email, status_update, publish_stream' }
end

get '/' do
    @articles = []
    @articles << {:title => 'Deploying Rack-based apps in Heroku', :url => 'http://docs.heroku.com/rack'}
    @articles << {:title => 'Learn Ruby in twenty minutes', :url => 'http://www.ruby-lang.org/en/documentation/quickstart/'}

    erb :index
end

get '/auth/facebook/callback' do
  session['fb_auth'] = request.env['omniauth.auth']
  session['fb_token'] = session['fb_auth']['credentials']['token']
  session['fb_error'] = nil
  redirect '/'
end

get '/auth/failure' do
  clear_session
  session['fb_error'] = 'In order to use this site you must allow us access to your Facebook data<br />'
  redirect '/'
end

get '/logout' do
  clear_session
  redirect '/'
end

def clear_session
  session['fb_auth'] = nil
  session['fb_token'] = nil
  session['fb_error'] = nil
end

Answer 1

从注释中复制答案，以便从“未回答”筛选器中删除此问题：

嘿，伙计们，我写的教程.我已经更新了tuto和代码，现在一切似乎都正常了，如果没有，请告诉我。它没有显示一些图像，因为我需要等待Heroku的批准，但它仍然有效：https://devcenter.heroku.com/articles/facebook-ruby

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