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copied!<p>For some reason replacing <code>:all</code> with the domain did not work (rails 3.2.11) for me. It took a piece of custom Middleware to fix it. A summary of that solution is below.</p> <p><strong>tl;dr:</strong> You need to write a custom Rack Middleware. You need add it into your <code>conifg/environments/[production|development].rb</code>. This is on Rails 3.2.11</p> <p>Cookie sessions are usually stored only for your top level domain.</p> <p>If you look in <code>Chrome -> Settings -> Show advanced settings… -> Privacy/Content settings… -> All cookies and site data… -> Search {yourdomain.com}</code> You can see that there will be separate entries for <code>sub1.yourdomain.com</code> and <code>othersub.yourdomain.com</code> and <code>yourdomain.com</code></p> <p>The challenge is to use the same session store file across all subdomains.</p> <h2>Step 1: Add Custom Middleware Class</h2> <p>This is where <a href="http://guides.rubyonrails.org/rails_on_rack.html" rel="nofollow noreferrer">Rack Middleware</a> comes in. Some relevant rack & rails resources:</p> <ul> <li><a href="http://railscasts.com/episodes/151-rack-middleware?view=asciicast" rel="nofollow noreferrer">Railscasts about Rack</a></li> <li><a href="http://guides.rubyonrails.org/rails_on_rack.html" rel="nofollow noreferrer">Railsguide for Rack</a></li> <li>Rack documentation for <a href="http://rack.rubyforge.org/doc/Rack/Session/Abstract/ID.html" rel="nofollow noreferrer">sesssions abstractly</a> and for <a href="http://rack.rubyforge.org/doc/Rack/Session/Cookie.html" rel="nofollow noreferrer">cookie sessions</a></li> </ul> <p>Here is a custom class that you should add in the <code>lib</code> <strong>This was written by <a href="https://stackoverflow.com/users/166918/nader">@Nader</a> and you all should thank him</strong></p> <pre><code># Custom Domain Cookie # # Set the cookie domain to the custom domain if it's present class CustomDomainCookie def initialize(app, default_domain) @app = app @default_domain = default_domain end def call(env) host = env["HTTP_HOST"].split(':').first env["rack.session.options"][:domain] = custom_domain?(host) ? ".#{host}" : "#{@default_domain}" @app.call(env) end def custom_domain?(host) host !~ /#{@default_domain.sub(/^\./, '')}/i end end </code></pre> <p>Basically what this does is that it will map all of your cookie session data back onto the exact same cookie file that is equal to your root domain.</p> <h2>Step 2: Add To Rails Config</h2> <p>Now that you have a custom class in lib, make sure are autoloading it. If that meant nothing to you, look here: <a href="https://stackoverflow.com/questions/4073856/rails-3-autoload">Rails 3 autoload</a></p> <p>The first thing is to make sure that you are system-wide using a cookie store. In <strong><code>config/application.rb</code></strong> we tell Rails to use a cookie store.</p> <pre><code># We use a cookie_store for session data config.session_store :cookie_store, :key => '_yourappsession', :domain => :all </code></pre> <p>The reason this is here is mentioned here is because of the <code>:domain => :all</code> line. There are other people that have suggested to specify <code>:domain => ".yourdomain.com"</code> instead of <code>:domain => :all</code>. For some reason this did not work for me and I needed the custom Middleware class as described above.</p> <p>Then in your <strong><code>config/environments/production.rb</code></strong> add:</p> <pre><code>config.middleware.use "CustomDomainCookie", ".yourdomain.com" </code></pre> <p>Note that the preceding dot is necessary. See "<a href="https://stackoverflow.com/questions/3865345/sub-domain-cookies-sent-in-a-parent-domain-request">sub-domain cookies, sent in a parent domain request?</a>" for why.</p> <p>Then in your <strong><code>config/environments/development.rb</code></strong> add:</p> <pre><code>config.middleware.use "CustomDomainCookie", ".lvh.me" </code></pre> <p>The lvh.me trick maps onto localhost. It's awesome. See <a href="http://railscasts.com/episodes/221-subdomains-in-rails-3" rel="nofollow noreferrer">this Railscast about subdomains</a> and <a href="http://pastebin.com/GUrn7vvE" rel="nofollow noreferrer">this note</a> for more info.</p> <p>Hopefully that should do it. I honestly am not entirely sure why the process is this convoluted, as I feel cross subdomain sites are common. If anyone has any further insights into the reasons behind each of these steps, please enlighten us in the comments.</p>

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