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Account middleware in Ruby On Rails - DEV Community
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</span> </span> </div> <h1 class=" fs-3xl m:fs-4xl l:fs-5xl fw-bold s:fw-heavy lh-tight mb-2 medium"> Account middleware in Ruby On Rails </h1> <div class="spec__tags flex flex-wrap"> <a class="crayons-tag " style=" --tag-bg: rgba(204, 0, 0, 0.10); --tag-prefix: #cc0000; --tag-bg-hover: rgba(204, 0, 0, 0.10); --tag-prefix-hover: #cc0000; " href="/t/rails"><span class="crayons-tag__prefix">#</span>rails</a> <a class="crayons-tag " style=" --tag-bg: rgba(59, 73, 223, 0.10); --tag-prefix: #3b49df; --tag-bg-hover: rgba(59, 73, 223, 0.10); --tag-prefix-hover: #3b49df; " href="/t/middleware"><span class="crayons-tag__prefix">#</span>middleware</a> </div> </div> </header> <div class="crayons-article__main "> <div class="crayons-article__body text-styles spec__body" data-article-id="434876" id="article-body"> <p>If you want to identify each request to your Rails application with specific account, you don't have to change your <code>routes.rb</code></p> <p>Instead, you can use Custom Middleware to implement this option.</p> <p>First, let's use <a href="https://api.rubyonrails.org/classes/ActiveSupport/CurrentAttributes.html">ActiveSupport::CurrentAttributes</a>. It will simplify the per-request attributes access.<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight ruby"><code><span class="c1"># app/models/current.rb</span> <span class="k">class</span> <span class="nc">Current</span> <span class="o"><</span> <span class="no">ActiveSupport</span><span class="o">::</span><span class="no">CurrentAttributes</span> <span class="n">attribute</span> <span class="ss">:account</span> <span class="k">end</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <p>This is our <code>AccountMiddlreware</code> that will identify an Account by the id, and update the request path accordingly.<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight ruby"><code><span class="c1"># lib/acount_middleware.rb</span> <span class="k">class</span> <span class="nc">AccountMiddleware</span> <span class="k">def</span> <span class="nf">initialize</span><span class="p">(</span><span class="n">app</span><span class="p">)</span> <span class="vi">@app</span> <span class="o">=</span> <span class="n">app</span> <span class="k">end</span> <span class="c1"># https://youapp.com/12345/projects</span> <span class="k">def</span> <span class="nf">call</span><span class="p">(</span><span class="n">env</span><span class="p">)</span> <span class="n">request</span> <span class="o">=</span> <span class="no">ActionDispatch</span><span class="o">::</span><span class="no">Request</span><span class="p">.</span><span class="nf">new</span> <span class="n">env</span> <span class="n">_</span><span class="p">,</span> <span class="n">account_id</span><span class="p">,</span> <span class="n">request_path</span> <span class="o">=</span> <span class="n">request</span><span class="p">.</span><span class="nf">path</span><span class="p">.</span><span class="nf">split</span><span class="p">(</span><span class="s1">'/'</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span> <span class="k">if</span> <span class="n">account_id</span> <span class="o">=~</span> <span class="sr">/\d+/</span> <span class="k">if</span> <span class="n">account</span> <span class="o">=</span> <span class="no">Account</span><span class="p">.</span><span class="nf">find_by</span><span class="p">(</span><span class="ss">id: </span><span class="n">account_id</span><span class="p">)</span> <span class="no">Current</span><span class="p">.</span><span class="nf">account</span> <span class="o">=</span> <span class="n">account</span> <span class="k">else</span> <span class="k">return</span> <span class="p">[</span><span class="mi">302</span><span class="p">,</span> <span class="p">{</span> <span class="s2">"Location"</span> <span class="o">=></span> <span class="s2">"/"</span> <span class="p">},</span> <span class="p">[]]</span> <span class="k">end</span> <span class="n">request</span><span class="p">.</span><span class="nf">script_name</span> <span class="o">=</span> <span class="s2">"/</span><span class="si">#{</span><span class="n">account_id</span><span class="si">}</span><span class="s2">"</span> <span class="n">request</span><span class="p">.</span><span class="nf">path_info</span> <span class="o">=</span> <span class="s2">"/</span><span class="si">#{</span><span class="n">request_path</span><span class="si">}</span><span class="s2">"</span> <span class="k">end</span> <span class="vi">@app</span><span class="p">.</span><span class="nf">call</span><span class="p">(</span><span class="n">request</span><span class="p">.</span><span class="nf">env</span><span class="p">)</span> <span class="k">end</span> <span class="k">end</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <p>Note:<br> <code>request.script_name</code> is required to overwrite other links on the page. Otherwise, the new link will be: <code>/projects/new</code><br> w/o the <code>account_id</code>.</p> <p>Add the middleware to your application and restart your Rails server.<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight ruby"><code><span class="c1"># config/application.rb</span> <span class="nb">require_relative</span> <span class="s1">'../lib/account_middleware'</span> <span class="k">class</span> <span class="nc">Application</span> <span class="o"><</span> <span class="no">Rails</span><span class="o">::</span><span class="no">Application</span> <span class="c1"># ...</span> <span class="n">config</span><span class="p">.</span><span class="nf">middleware</span><span class="p">.</span><span class="nf">use</span> <span class="no">AccountMiddleware</span> <span class="k">end</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" 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