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POadding class specific functionality in ruby modules
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2012-01-19T07:49:05.690
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possibly I'm not explaining the concept very well, but I'm looking to add class methods to a series of ruby classes to enable them to hold class specific information which will then be called by individual instance methods of the classes. I can make it work, but it is a bit ugly. Can anyone as it requires 2 modules, one included and the other extended (see example code below). Can anyone think of a more elegant way of implementing this functionality ? Thanks Steve This module is extended to give class methods but adding an instance member to each class it is included in <pre><code>module My1 def my_methods (*sym_array) @my_methods=sym_array end def method_list @my_methods end end </code></pre> This module is included to give instance methods <pre><code>module My2 def foo self.class.method_list.each { |m| self.send m } end end </code></pre> Now use the modules - the ugliness is having to use an include and extend statement to allow me to pass a set of symbols to a class method which will then be implemented in an instance <pre><code>class Foo extend My1 include My2 my_methods :baz def baz puts "Baz!" end end class Bar extend My1 include My2 my_methods :frodo def frodo puts "Frodo!" end end class Wibble < Bar extend My1 include My2 my_methods :wobble def wobble puts "Wobble!" end end </code></pre> Here is the required output - note that each class has its own instance @my_methods so the behaviour is different for the derived class Wibble < Bar <pre><code>f=Foo.new b=Bar.new w=Wibble.new f.foo #=> "Bar!" b.foo #=> "Frodo!" w.foo #=> "Wobble!" </code></pre>
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adding class specific functionality in ruby modules
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1. USSteve Gooberman-Hill
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