# Get modules that are in a class? **URL:** \ **Category:** ruby-talk\ **Created:** [8 July 2007 02:00 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923 "2007-07-08T02:00:55Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Aaron\_Smith](https://avatars.discourse-cdn.com/v4/letter/a/df788c/32.png) [@Aaron\_Smith](https://rubytalk.org/u/Aaron_Smith)\ **Post date:** [8 July 2007 02:00 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/1 "2007-07-08T02:00:55Z")
is it possible to find out what modules have been included inside of a class? > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Wayne\_E\_Seguin](https://avatars.discourse-cdn.com/v4/letter/w/d26b3c/32.png) [@Wayne\_E\_Seguin](https://rubytalk.org/u/Wayne_E_Seguin)\ **Post date:** [8 July 2007 02:16 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/2 "2007-07-08T02:16:23Z")
Yes Aaron it is, via the method "included\_modules" [http://www.ruby-doc.org/core/classes/Module.html#M001697](http://www.ruby-doc.org/core/classes/Module.html#M001697) > **···** > > On Jul 07, 2007, at 22:00 , Aaron Smith wrote: > > > is it possible to find out what modules have been included inside of a > > class? > > -- > Wayne E. Seguin > Sr. Systems Architect & Systems Admin > wayneseguin@gmail.com ---
**Author:** ![Aaron\_Smith](https://avatars.discourse-cdn.com/v4/letter/a/df788c/32.png) [@Aaron\_Smith](https://rubytalk.org/u/Aaron_Smith)\ **Post date:** [8 July 2007 02:47 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/3 "2007-07-08T02:47:23Z")
Wayne E. Seguin wrote: > > is it possible to find out what modules have been included inside of a > > class? > > Yes Aaron it is, via the method "included\_modules" > > [class Module - RDoc Documentation](http://www.ruby-doc.org/core/classes/Module.html#M001697) What about within a class? module TestModule   def say\_something     puts "SOMETHING"   end end class Test   include TestModule end t = Test.new puts t.included\_modules > **···** > > > On Jul 07, 2007, at 22:00 , Aaron Smith wrote: > > -- > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). ---
**Author:** ![Wayne\_E\_Seguin](https://avatars.discourse-cdn.com/v4/letter/w/d26b3c/32.png) [@Wayne\_E\_Seguin](https://rubytalk.org/u/Wayne_E_Seguin)\ **Post date:** [8 July 2007 03:06 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/4 "2007-07-08T03:06:51Z")
Aaron, you can define a method within your class to expose this like so: module TestModule    def say\_something      puts "SOMETHING"    end end class Test    include TestModule    def modules      self.class.included\_modules    end end t = Test.new puts t.modules If you need this exposed for all classes you can expose for the Object class: class Object    def modules      self.class.included\_modules    end end Does this help? Without knowing what you're trying to accomplish further it's difficult to come up with an optimal solution 🙂 > **···** > > On Jul 07, 2007, at 22:47 , Aaron Smith wrote: > > > What about within a class? > > > > module TestModule > >   def say\_something > >     puts "SOMETHING" > >   end > > end > > > > class Test > >   include TestModule > > end > > > > t = Test.new > > puts t.included\_modules > > -- > Wayne E. Seguin > Sr. Systems Architect & Systems Admin > wayneseguin@gmail.com ---
**Author:** ![Travis\_D\_Warlick\_Jr](https://avatars.discourse-cdn.com/v4/letter/t/e9bcb4/32.png) [@Travis\_D\_Warlick\_Jr](https://rubytalk.org/u/Travis_D_Warlick_Jr)\ **Post date:** [8 July 2007 03:10 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/5 "2007-07-08T03:10:00Z")
Aaron Smith wrote: > Wayne E. Seguin wrote: > > > > is it possible to find out what modules have been included inside of a > > > class? > > > > Yes Aaron it is, via the method "included\_modules" > > > > [class Module - RDoc Documentation](http://www.ruby-doc.org/core/classes/Module.html#M001697) > > What about within a class? > > module TestModule >   def say\_something >     puts "SOMETHING" >   end > end > > class Test >   include TestModule > end > > t = Test.new > puts t.included\_modules Remember that when you include the module, you're including \_all\_ the module's methods (including Module#included\_modules) So, use self.class to get the Class object of the current instance (this will work from the included modules also), so you should be able to do: self.class.included\_modules And a debugging efficiency tip: use the Array#sort method with the Module#included\_modules to sort the list of included modules for easier viewing. I use this all the time in IRB. (This also works with Class#methods and all the like) irb(main):001:0\> YourClass.methods.sort > **···** > > > > On Jul 07, 2007, at 22:00 , Aaron Smith wrote: > > -- >   Travis Warlick >   Operis Systems, LLC >   Lead Developer ---
**Author:** ![Aaron\_Smith](https://avatars.discourse-cdn.com/v4/letter/a/df788c/32.png) [@Aaron\_Smith](https://rubytalk.org/u/Aaron_Smith)\ **Post date:** [8 July 2007 03:15 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/6 "2007-07-08T03:15:56Z")
> And a debugging efficiency tip: use the Array#sort method with the > Module#included\_modules to sort the list of included modules for easier > viewing. I use this all the time in IRB. (This also works with > Class#methods and all the like) > > irb(main):001:0\> YourClass.methods.sort Thanks. That's perfect. > **···** > > -- > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). ---
**Author:** ![Wayne\_E\_Seguin](https://avatars.discourse-cdn.com/v4/letter/w/d26b3c/32.png) [@Wayne\_E\_Seguin](https://rubytalk.org/u/Wayne_E_Seguin)\ **Post date:** [8 July 2007 03:18 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/7 "2007-07-08T03:18:00Z")
Aaron, Scratch that last, it's far easier than that: module TestModule    def say\_something      puts "SOMETHING"    end end class Test    include TestModule end t = Test.new puts t.class.included\_modules > **···** > > On Jul 07, 2007, at 23:06 , Wayne E. Seguin wrote: > > > Aaron, > > > > you can define a method within your class to expose this like so: > > > > module TestModule > >   def say\_something > >     puts "SOMETHING" > >   end > > end > > > > class Test > >   include TestModule > >   def modules > >     self.class.included\_modules > >   end > > end > > > > t = Test.new > > puts t.modules > > > > If you need this exposed for all classes you can expose for the Object class: > > > > class Object > >   def modules > >     self.class.included\_modules > >   end > > end > > > > Does this help? > > Without knowing what you're trying to accomplish further it's difficult to come up with an optimal solution 🙂 > > -- > Wayne E. Seguin > Sr. Systems Architect & Systems Admin > wayneseguin@gmail.com ---
**Author:** ![David\_A\_Black3](https://avatars.discourse-cdn.com/v4/letter/d/6a8cbe/32.png) [@David\_A\_Black3](https://rubytalk.org/u/David_A_Black3)\ **Post date:** [8 July 2007 11:32 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/8 "2007-07-08T11:32:49Z")
Hi -- > Aaron Smith wrote: > > > Wayne E. Seguin wrote: > > > > > > is it possible to find out what modules have been included inside of a > > > > class? > > > > > > Yes Aaron it is, via the method "included\_modules" > > > > > > [class Module - RDoc Documentation](http://www.ruby-doc.org/core/classes/Module.html#M001697) > > > > What about within a class? > > > > module TestModule > >   def say\_something > >     puts "SOMETHING" > >   end > > end > > > > class Test > >   include TestModule > > end > > > > t = Test.new > > puts t.included\_modules > > Remember that when you include the module, you're including \_all\_ the > module's methods (including Module#included\_modules) It's not exactly an inclusion thing. Class objects already respond to #included\_modules, because Class inherits from Module. > So, use self.class to get the Class object of the current instance (this > will work from the included modules also), so you should be able to do: > > self.class.included\_modules That will work with any object:    "".class.included\_modules etc. It's not dependent on your having included a module. David > **···** > > On Sun, 8 Jul 2007, Travis D Warlick Jr wrote: > > > > > On Jul 07, 2007, at 22:00 , Aaron Smith wrote: > > -- > \* Books: >    RAILS ROUTING (new! [http://www.awprofessional.com/title/0321509242\](http://www.awprofessional.com/title/0321509242%5C)) >    RUBY FOR RAILS ([http://www.manning.com/black\](http://www.manning.com/black%5C)) > \* Ruby/Rails training >      & consulting: Ruby Power and Light, LLC ([http://www.rubypal.com](http://www.rubypal.com)) ---
**Author:** ![vasudevram](https://avatars.discourse-cdn.com/v4/letter/v/bbce88/32.png) [@vasudevram](https://rubytalk.org/u/vasudevram)\ **Post date:** [11 July 2007 13:17 UTC](https://rubytalk.org/t/get-modules-that-are-in-a-class/38923/9 "2007-07-11T13:17:36Z")
> YourClass.methods.sort Yes, that's a useful trick. I use it all the time. We can also make up many more such, with a bit of thought. Another one I use a lot, when I think that some class is likely to have a method with some substring in its name, is: YourClass.methods.grep /substring/ e.g. : String.methods.grep /case/ # to find out what the String method name to uppercase (or lowercase) a string, is called. or "".methods.grep /case/ Vasudev Ram > **[dancingbison.com](http://ww38.dancingbison.com/)** > > Learn Python Programming > **[jugad's Journal](https://jugad.livejournal.com/)** > > Vasudev Ram's blog on software innovation > **[Conversion of other file formats to PDF](https://sourceforge.net/projects/xtopdf)** > > Download Conversion of other file formats to PDF for free. xtopdf: Tools to convert other formats (x) to PDF; x as in math.