Rails - Jan 2009 - Aggregation: problem with uninitialized composed_of object

Hi,

I''m getting this error:
>> p = Plan.new
>> p.amount
TypeError: wrong argument type String (expected Fixnum)

Apparently this happens because the aggregation isn''t initialized.
Here''s the code:

class Plan < ActiveRecord::Base
    composed_of :amount,
              :class_name => "Money",
              :converter  => Proc.new { |s| Money.new(s) },
              :mapping    => [:price, :value]
end

class Money
  attr_reader :value

  def initialize(string)
    @value = BigDecimal(string.sub(/,/, ''.''))
  end

  def to_s
    Integer(@value * 100).to_s.sub(/(\d{2})$/, '',\1'')
  end
end

I would like to hide the aggregation from controllers...

There''s the after_initialization callback where I could (try to)
initialize the value object if it is nil...

I wonder what''s the proper way to deal with this situation?

Thanks,

--
Adriano

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For the record...

On Jan 16, 4:17 pm, Adriano
<adri...-S20CnuFijpQ39yzSjRtAkw@public.gmane.org>
wrote:
> TypeError: wrong argument type String (expected Fixnum)
[snip]
>   def initialize(string)
>     @value = BigDecimal(string.sub(/,/, ''.''))
>   end
The problem was that value object can be initialized with a string
(from the form) or with a number (from the db). Thus initialize should
be changed, eg:

def initialize(value)
  @value = BigDecimal(value.to_s(/,/, ''.''))
end

--
Adriano


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