Aggregation: problem with uninitialized composed_of object


#1

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


#2

For the record…

On Jan 16, 4:17 pm, Adriano removed_email_address@domain.invalid 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