Include module Module ActiveSupport::CoreExtensions::Array::Grouping

ruby-talk
1

I want to use the grouping method(s) from the subject module, but I
can't translate it address into a ruby include.

The module's documented at http://rails.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Array/Grouping.html.

Thanks in Advance for any guidance offered.
Richard

2

require "<your path to
here->/lib/active_support/core_ext/array/grouping"

Then you will have something like this at the top of your file:

module A
  module B
    module C

      def in_group
        puts "in_group"
      end

    end
  end
end

Which means you can do this:

class MyClass
  include A::b::C
end

MyClass.new.in_group

--output:--
in_group

I think that Grouping is defined as a "mixin" module--in other words it
is a module which contains regular def's inside it:

module ActiveSupport
  module CoreExtension
    module Array
      module Grouping

         def in_group
           ..
           ..
         end

      end
    end
  end
end

You can't create a module instance, like you can with a class. So you
are not able to create a Grouping instance:

obj = Grouping.new

and call the method using the instance:

obj.in_group

Rather mixin modules are created to be included by a class, and then the
defs in the module become defs in the class.

···

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3

Or, you can also do something like this:

module A
  module B
    module C

      def in_group
        puts 'in_group'
      end

    end
  end
end

include A::b::C
in_group

include() at the top-level causes the defs in the module to be included
in the Object class, which means you can call in_group (without a
receiver) from anywhere.

···

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