ruby - Const_missing hook isn't fired -


i money patched const_missing methods object , in difference contexts:

auto_loader.rb

%w{../../lib ../../app}.each |path|   expanded_path = file.expand_path(path,__file__)   $load_path.unshift(expanded_path) unless $load_path.include?(expanded_path) end class object def self.inherited(base)     base.extend(class_methods)     super   end    def const_missing(const)     puts "loading(in object) %s" % const.to_s     path = const.to_s.split('::').compact.map(&:downcase).join('/')      require path     self.const_get(const)   end   class << self     def const_missing(const)       puts "loading(in object class << self) %s" % const.to_s       path = const.to_s.split('::').compact.map(&:downcase).join('/')        require path       self.const_get(const)     end   end   module class_methods     class << self       def const_missing(const)         puts "loading(in class_methods class << self) %s" % const.to_s         path = const.to_s.split('::').compact.map(&:downcase).join('/')          require path         self.const_get(const)       end     end        def const_missing(const)       puts "loading(in class_methods) %s" % const.to_s       path = const.to_s.split('::').compact.map(&:downcase).join('/')        require path       self.const_get(const)     end    end    extend class_methods end

when run code, see:

nameerror: uninitialized constant const

without of puts displayed.

i load code with:

pry -r ./lib/auto_loader.rb

the result same.

on other hand, if manually fire const_missing method, see loading(in object) const.

why const_missing hook not fired?

your example not minimal , not run. if try following works without problem. think problem related else.

class object    def self.inherited(base)     base.extend(class_methods)     super   end    def self.const_missing_impl(const, location)     puts "loading(in #{location}) %s" % const.to_s     path = const.to_s.split('::').compact.map(&:downcase).join('/')      puts "require #{path}"   end    def const_missing(const)     object.const_missing_impl(const, 'object')   end    class << self     def const_missing(const)       object.const_missing_impl(const, 'object class << self')     end   end    module class_methods     def const_missing(const)       object.const_missing_impl(const, 'class_methods')     end      class << self       def const_missing(const)         object.const_missing_impl(const, 'class_methods class << self')       end     end   end    extend class_methods end  = const1 b = a::const2 c = string::const3 d = class_methods::const4  # prints loading(in object class << self) const1 require const1 loading(in object class << self) const2 require const2 loading(in object class << self) const3 require const3 loading(in class_methods class << self) const4 require const4

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