From: Sergey Sheypak <serega.sheypak@...>
Date: 2010-02-12T18:23:15+09:00
Subject: Re: String to symbol

Robert Klemme wrote:
> 2010/2/12 Sergey Sheypak <serega.sheypak@gmail.com>:
>> �def is_attr_allowed!(attr)
> IMHO that method would rather be called ensure_attr_allowed - if you
> call it is_... I would expect it to return a boolean.
I've added "!" to show that it can throw exception (like in rails)
> 
> Are you sure this is what you want?  It seems you change the accessor
> method for *all* instances to return the *same* value.  I don't think
> this is a good idea.
I have a bean. Bean can accept certain fields in his constructor.
List of certain fields is overriden in each subclass of DataBean.
I read source (csv) file and try to construct bean using dats from 
source and my bean.

> 
>> So I can use 'rails like intializers'
>>
>> As I read, :symbols are constants, they are immutable and have int
>> representation. These facts help to spend less memory and resources.
>>
>> Do I have any opportunity to pass Strings into my initializers?
> 
> Did you try it out with your code?  Was there an issue, if so, which 
> one?
> 
Code works fine.
I've just added to config.yaml:
---
Dates:
  class: Dates
  fields_ordered: [:start, :current, :end]

and
 @conf = YAML::load( File.open( 'config.yml' ) ) #keeps parsed YAML
#some code
#block_name id a current 'top' name like 'Dates'
@struct[:fields] = @conf[block_name]['fields_ordered']
#and later...
private
  def init_hash(arr)
    Hash[*@struct[:fields].collect {|v| [v, 
arr[@struct[:fields].index(v)]]}.flatten]
  end

It's method for converting csv line:
lol, 123,lolo, 123.45
to hash using appopriate bean field names as keys





> Kind regards
> 
> robert

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