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copied!<p>Sinatra <a href="https://github.com/sinatra/sinatra/blob/v1.3.3/lib/sinatra/base.rb#L1369-1370">aliases the <code>new</code> method to <code>new!</code></a> before redefining it, so the simplest solution is to use that instead:</p> <pre><code>def app MyApp.new! end </code></pre> <p>Of course I only noticed that <em>after</em> I’d come up with the following, which I’ll leave in as it could be useful/informative.</p> <hr> <p>A possible way to get round Sinatra <a href="https://github.com/sinatra/sinatra/blob/v1.3.3/lib/sinatra/base.rb#L1372-1377">redefining the <code>new</code> method and returning a complete Rack app</a> a get hold of an instance your actual base class is to do what the “real” <code>new</code> method does yourself:</p> <pre><code>def app a = MyApp.allocate a.send :initialize a end </code></pre> <p>This is a bit of a hack, but it might be useful for testing.</p> <p>Another technique would be to “walk” the middleware stack until you got to your class. The following is a little fragile, as it depends on all the middleware involved to use the name <code>@app</code> to refer to the next app in the stack, but this is fairly common.</p> <pre><code>def app a = MyApp.new while a.class != MyApp a = a.instance_variable_get(:@app) end a end </code></pre> <p>That won’t work on the yet to be released Sinatra 1.4 though (at least not on the current master, which is <a href="https://github.com/sinatra/sinatra/tree/41840746e866e8e8e9a0eaafc53d8b9fe6615b12">commit 41840746e866e8e8e9a0eaafc53d8b9fe6615b12</a>), as <code>new</code> now returns a <a href="https://github.com/sinatra/sinatra/blob/41840746e866e8e8e9a0eaafc53d8b9fe6615b12/lib/sinatra/base.rb#L1767-1787"><code>Wrapper</code> class</a> and the loop never ends. In this case you can grab the base class directly from the <code>@instance</code> variable:</p> <pre><code>def app MyApp.new.instance_variable_get :@instance end </code></pre> <p>(note this last technique may well change before the final 1.4 release).</p>

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