From: "B. K. Oxley (binkley)" <binkley@...>
Date: 2005-03-30T05:03:48+09:00
Subject: Re: attr :<symbol>?

Florian Gross wrote:
> Glenn Smith wrote:
>> class Meta
>>   def self.has_many( sym )
>>     attr_tmp = "def  #{sym.to_s} \n"
>>     attr_tmp << " @#{sym.to_s} = [] unless @#{sym.to_s}\n"
>>     attr_tmp << " @#{sym.to_s}; end"
>>     eval ( attr_tmp  )
>>   end
>> end
> 
> class Meta
>   def self.has_many(sym)
>     ivar = :"@#{sym}"
>     define_method(sym.to_sym) do
>       new_value = instance_variable_get(ivar) || []
>       instance_variable_set(ivar, new_value)
>       new_value
>     end
>   end
> end

What is the difference between these two approaches?

* Is one more 'culturally correct'?
* Does one perform better?
* Is one more future-proof?


Thanks,
--binkley