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Home/ Questions/Q 6048497
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T07:28:11+00:00 2026-05-23T07:28:11+00:00

Can anyone tell me why I get a NameError – uninitialized constant Sinatra::Default when

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Can anyone tell me why I get a NameError - uninitialized constant Sinatra::Default when calling the /admin route?

require "sinatra"
require "sinatra/authorization"

set :authorization_realm, "Protected zone"

helpers do
  def authorize(login, password)
    login == "admin" && password == "secret"
  end
end

get "/" do
  "Welcome to the public zone"
end

get "/admin" do
  login_required
  "Welcome to the protected zone"
end

I’m using Ruby 1.9.2, Sinatra 1.2.6 and the Sinatra Authorization Extension.

UPDATE: OK, I’ve found the source of the problem at line 25 of the following file:

sinatra-authorization-1.0.0/lib/sinatra/authorization.rb

This fork of the original project solved the problem by replacing Sinatra::Default.authorization_realm with settings.authorization_realm at line 25. This solves the problem, but I don’t understand why. Can anyone explain that to me?

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  1. Editorial Team
    Editorial Team
    2026-05-23T07:28:12+00:00Added an answer on May 23, 2026 at 7:28 am

    It’s solves the problem because Sinatra doesn’t have Default class anymore. And if you want to access some settings defined with :set you should use settings. for this.

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