Get sinatra environment from within instance method

puts Sinatra::Application.environment

#=> production (or test, development)

I would use Sinatra::Base.development? or Sinatra::Base.production? since that is where the methods are coming from.

self.class.development? should actually work. These all work for me on Sinatra 1.3.1:

class Main < Sinatra::Base
  get '/' do
    puts Main.development?
    puts self.class.development?
    puts settings.development?
    puts settings.environment == :development
  end
end