How to share a method between classes defined via Ruby Struct?

Question

Given a set of classes defined using Structs, like :

K1=Struct.new(:a,:b)
K2=Struct.new(:c,:d)
...

is it still possible to add a single common method :foo to every class defined that way, or do I need a deep refactoring ?

Factoring such behaviors is normally done using inheritance (or mixins), but I don't know if such a factoring is now still possible, starting with such struct-based class definitions.

Matheus Moreira · Accepted Answer · 2014-05-12 20:26:29Z

2

You can simply mix a module into both structures.

module A
  def foo
  end
end

B = Struct.new :a, :b do include A end
C = Struct.new :c, :d do include A end

puts B.new.respond_to? :foo  # => true
puts C.new.respond_to? :foo  # => true

See Module#include and Object#extend for detailed documentation on how this works.

answered May 12, 2014 at 20:26

Matheus Moreira

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