Rails - Dec 2011 - has_many transaction rollback problem

I have bellow one model has many other model.

The question is when i update 2 models. One model is validate failed.
The other model can not rollback.

Sample:

class User < ActiveRecord::Base
  has_many :products, :dependent => :destroy
  validates_presence_of :name
end

class Product < ActiveRecord::Base
  belongs_to :user
end

# do a update

User.transaction do
  user = User.find(1)
  p user.products # => [#product1,#product2]
  user.products = [#product3, #product4]
  user.name = ""
  user.save
end

=>
validate error: Name can''t be blank

But when you run bellow.
user = User.find(1)
p user.products   # => [#product3,#product4]

How can i resolve this problem?
I don''t need products are updated.

I use
.mysql innoDB
.Rails 3.0.3
.activerecord (3.0.3)


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On Dec 15, 9:04 am, Grant
<kucss2...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> User.transaction do
>   user = User.find(1)
>   p user.products # => [#product1,#product2]
>   user.products = [#product3, #product4]
>   user.name = ""
>   user.save
> end
>
> =>
> validate error: Name can''t be blank
>
> But when you run bellow.
> user = User.find(1)
> p user.products   # => [#product3,#product4]
>
> How can i resolve this problem?
> I don''t need products are updated.

The save is wrapped in a save point which should be rolled back,
however when you assign to a has_many like that the change is made
straightaway to the products.
You could raise ActiveRecord::Rollback to force the outermost
transaction to be rolled back

Fred

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