method 
 method_missing
 
  Ruby on Rails latest stable (v7.1.3.2) - 0 notes - Class: Rails::Railtie::Configuration   
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- What's this?
method_missing(name, *args, &blk) private  Hide source   
 # File railties/lib/rails/railtie/configuration.rb, line 99 def method_missing(name, *args, &blk) if name.end_with?("=") key = name[0..-2].to_sym if actual_method?(key) raise NoMethodError.new("Cannot assign to `#{key}`, it is a configuration method") end @@options[key] = args.first elsif @@options.key?(name) @@options[name] else super end end

 RSpec
RSpec Ruby on Rails
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  = protected
 = protected 