[DataMapper] Association callbacks are not wrapped in the same transaction.

[trung]

class Post
  has n, comments
  property :comments_count, Integer
end

class Comment
 belongs_to :post
 after :save do
   post.comments_count +=1
   post.save
 end
end

#ignore the other attributes

So when I do something like

post.comments.create()

I expect the INSERT and UPDATE statements to be in the same
transaction.
Instead I see this:

INSERT into comments
BEGIN
UPDATE posts
COMMIT

I believe that ActiveRecord would wrap all the callback in the same
transaction.

So in order to guarantee transaction I have to rewrite it to this.

class Post
  has n, comments
  property :comments_count, Integer

  def add_comments
    comments_count += 1
    comments.new(...)
    save
  end
end

class Comment
 belongs_to :post
end

then call post.add_comment(...)


Thanks for reading.

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