Problems with composed_of

rubyonrails-talk
1

Hi,

I'm having problems with composed_of

I have this two classes:

class Declaration < ActiveRecord::Base   composed_of :amount, :class_name => "Currency", :mapping => %w(amount amount) end

class Currency   attr_accessor :round, :decimal, :amount

  def initialize(amount)     self.amount = amount     self.round = amount.to_i.to_s[0..-3]     self.decimal = amount.to_i.to_s[-2..-1]   end

end

What I want to do: I want "amount" of the declaration model to be an object. I'm trying to execute the following;

declaration = Declaration.new

=> #<Declaration:0xb739f1b8 @attributes={"updated_at"=>nil, "description"=>nil, "amount"=>nil, "user_id"=>nil, "created_at"=>nil}, @new_record=true>

declaration.amount = 12

NoMethodError: undefined method `amount' for 12:Fixnum         from (eval):3:in `amount='         from (irb):2

I would like to be able to do: declaration.amount = 1200 declaration.amount.cents() # or something like that)

What am I doing wrong?

2

LeonB wrote:

class Declaration < ActiveRecord::Base   composed_of :amount, :class_name => "Currency", :mapping => %w(amount amount) end

class Currency   attr_accessor :round, :decimal, :amount

  def initialize(amount)     self.amount = amount     self.round = amount.to_i.to_s[0..-3]     self.decimal = amount.to_i.to_s[-2..-1]   end

I would like to be able to do: declaration.amount = 1200

declaration.amount = Currency.new(1200)

3

Thanks for the reply. But doing Currency.new() every time seems a bit like a hassle.

4

Ah, added this tot the model:

  def amount=(amount)     @amount = Currency.new(amount)   end

that worked nicely.