From: Rajinder Yadav <devguy.ca@...>
Date: 2009-12-15T20:55:53+09:00
Subject: Re: meta-programming

Brian Candler wrote:
> Jes炭s Gabriel y Gal叩n wrote:
>> irb(main):051:0> C.add_method(:name) {@name}
>> => #<Proc:0xb7cb9de8@(irb):51>
>> irb(main):052:0> C.add_method(:name=) {|value| @name = value}
>> => #<Proc:0xb7cb3bf0@(irb):52>
>> irb(main):053:0> c = C.new
>> => #<C:0xb7cb16d4>
>> irb(main):054:0> c.name=3
>> => 3
>> irb(main):055:0> c.name
>> => 3
> 
> Of course, since 'name' is static here, you could just include a module.
> 
> It gets more fun when the names of the accessors themselves are dynamic. 
> At this point it really does make more sense to use string eval, rather 
> than the alternative (instance_variable_get and instance_variable_set).
> 
> Have a look at define_method_attribute= in the following:
> http://github.com/rails/rails/blob/master/activerecord/lib/active_record/attribute_methods/write.rb

Thanks for pointing out the path to  ActiveRecord, I haven't gotten use 
to browsing source code, this is really helpful!

> 
> Also see define_read_method in attribute_methods/read.rb, and 
> method_missing in base.rb (this defines finder methods dynamically)

cool I will do that =)


-- 
Kind Regards,
Rajinder Yadav

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