Rails - Dec 2005 - bug? saving (valid) updated object results in validation error

Hi!

I have an error that I don''t understand. It shouldn''t be
happening,
according to the documentation! I have a class, defined as below.
> class Coupon < ActiveRecord::Base
>   belongs_to  :product
>   belongs_to :account
>   validates_presence_of :product
>   validates_associated :product
>   validates_presence_of :voucher
>   validates_presence_of :price_sold
>   validates_uniqueness_of :voucher
>   validates_length_of :voucher, :within => 10 .. 50
>   validates_numericality_of :price_sold
>   validates_numericality_of :voucher, :only_integer => true
>   validates_each :price_sold do |rec, s, t|
>     t ||= 0; rec.errors.add s, "negative price" if t < 0
>   end

Using script/console as follows:-
> >> c = Coupon.find :first
> => #<Coupon:0x24d3e64 @attributes={"created_on"=>nil,  
> "account_id"=>nil, "updated_on"=>nil,
"product_id"=>"11",
> "used_on"=>nil, "id"=>"42",
"used"=>"f",
> "voucher"=>"22334455667788990011",
"price_sold"=>"0.0"}>
> >> c.save
> => false
> >> c
> => #<Coupon:0x24d3e64 @errors=#<ActiveRecord::Errors:0x24d2514  
> @errors={"product"=>["can''t be blank"],
"voucher"=>["has already
> been taken"]}, @base=#<Coupon:0x24d3e64 ...>>, @attributes= 
> {"created_on"=>nil, "account_id"=>nil,
"updated_on"=>nil,
> "product_id"=>"11", "used_on"=>nil,
"id"=>"42", "used"=>"f",
> "voucher"=>"22334455667788990011",
"price_sold"=>"0.0"}, @product=nil>
> >>
>
It appears that

a) the coupon is really valid, and is fetched from the database.

b) saving it again does not work, (I don''t know why, especially as  
the API documentation says the below text for save)

c) validates_uniqueness_of :voucher appears to be the culprit. I  
removed it and lo and behold, it saved.
> No record exists: Creates a new record with values matching those  
> of the object attributes.
> A record does exist: Updates the record with values matching those  
> of the object attributes.
It should update the record with the new values. I am running into  
this when I retrieve the object, update some values and when I  
attempt to save ... it gives a
"Voucher has already been taken" error message, indicating that it  
things I am trying to save a duplicate object, when it should instead  
realize I am using the right object!

Here''s information about my Rails version:-
> Rails version
> 1.0.0
> Active Record version
> 1.13.2
> Action Pack version
> 1.11.2
> Action Web Service version
> 1.0.0
> Action Mailer version
> 1.1.5
> Active Support version
> 1.2.5
How can I get this working yet keep the  
validates_uniqueness_of :voucher constraint? Thanks for any help!

-- G.



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