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POHeroku's Facebook Canvas app tutorial: oath error
 

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    <p>I'm copy and pasting the code from Heroku's tutorial about building a canvas app to host on Heroku seen here. <a href="https://devcenter.heroku.com/articles/facebook-ruby" rel="nofollow">https://devcenter.heroku.com/articles/facebook-ruby</a> However, I'm getting this error which the backtrace (see below) says is related to omniauth. </p> <p>Can anyone explain</p> <pre><code>NoMethodError at / undefined method `include?' for nil:NilClass file: builder.rb location: call line: 29 </code></pre> <p>These are the gems it uses</p> <pre><code>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 &lt;&lt; @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 </code></pre> <p><strong>Main code</strong></p> <p>index.erb</p> <pre><code>&lt;%=session['fb_error']%&gt; &lt;% if session['fb_auth'] %&gt; &lt;a href='logout'&gt;&lt;img src='images/fb_logout_button.png'&gt;&lt;/a&gt; &lt;% else %&gt; &lt;a href='auth/facebook'&gt;&lt;img src='images/fb_login_button.png'&gt;&lt;/a&gt; &lt;% end %&gt; &lt;h3&gt;&lt;%= 'Hello, ' + session['fb_auth']['user_info']['first_name'] + ', ' if session['fb_token'] %&gt;Welcome to my list of interesting articles.&lt;/h3&gt; &lt;table&gt; &lt;% @articles.each do |article| %&gt; &lt;tr&gt; &lt;td class='article'&gt;- &lt;a href='&lt;%=article[:url]%&gt;' target='_blank'&gt;&lt;%=article[:title]%&gt;&lt;/a&gt;&lt;/td&gt; &lt;td&gt; &lt;% if session['fb_auth'] %&gt; &lt;iframe src="http://www.facebook.com/plugins/like.php?href=&lt;%=article[:url]%&gt;&amp;amp;layout=button_count&amp;amp;show_faces=true&amp;amp;width=450&amp;amp;action=like&amp;amp;colorscheme=light&amp;amp;height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:21px;" allowTransparency="true"&gt;&lt;/iframe&gt; &lt;% end %&gt; &lt;/td&gt; &lt;/tr&gt; &lt;% end %&gt; &lt;/table&gt; &lt;% if session['fb_auth'] %&gt; &lt;hr /&gt; &lt;p&gt;&lt;span class='like_site'&gt;Do you like this site?&lt;/span&gt;&lt;/p&gt; &lt;p&gt;&lt;iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Ffaceboku.heroku.com%2F&amp;amp;layout=standard&amp;amp;show_faces=true&amp;amp;width=450&amp;amp;action=like&amp;amp;colorscheme=light&amp;amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:80px;" allowTransparency="true"&gt;&lt;/iframe&gt;&lt;/p&gt; &lt;% end %&gt; </code></pre> <p>Faceboku.rb</p> <pre><code>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 =&gt; 'email, status_update, publish_stream' } end get '/' do @articles = [] @articles &lt;&lt; {:title =&gt; 'Deploying Rack-based apps in Heroku', :url =&gt; 'http://docs.heroku.com/rack'} @articles &lt;&lt; {:title =&gt; 'Learn Ruby in twenty minutes', :url =&gt; '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&lt;br /&gt;' 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 </code></pre>
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    1. CO2nding this, I'm following the tutorial as well and can't get it working. It seems to be bundler is having trouble finding the omniauth gem.
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      1. USHarry Moreno
    2. COIt seems to be Omniauth's builder class is choking on an @ins variable that may be environment dependent.
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      1. USHarry Moreno
    3. COHey, guys, I wrote that tutorial, I haven't had time to review it and update it, but I'll do it soon, please, be patient. I will let you guys know through this post when it's updated. Thanks!
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