Rails - Jan 2006 - Cloning a one-many association

Hi, I want to make a copy of an object with its associations, and I am 
looking for an elegant solution. This is what I intuitively think should 
work, but it doesn''t:

order2 = order1.clone
order1.line_items.each do |o|
  order2.line_items.build(o)
end

This doesn''t work because a model class does not stringify its keys ...
so I can''t pass an object into a method that wants a hash, because an 
object doesn''t convert itself to a hash when needed.

Is there a simple way to solve this problem, or is this something where 
I will need to do my own plumbing of sorts?

Thanks
Joerg

-- 
Posted via http://www.ruby-forum.com/.

Hi, Joerg,

haven''t tried it myself, but you might want to try:

order2.line_items.build(o.attributes())

Best regards
Jan



Joerg Diekmann wrote:
> Hi, I want to make a copy of an object with its associations, and I am 
> looking for an elegant solution. This is what I intuitively think should 
> work, but it doesn''t:
>
> order2 = order1.clone
> order1.line_items.each do |o|
>   order2.line_items.build(o)
> end
>
> This doesn''t work because a model class does not stringify its
keys ...
> so I can''t pass an object into a method that wants a hash, because
an
> object doesn''t convert itself to a hash when needed.
>
> Is there a simple way to solve this problem, or is this something where 
> I will need to do my own plumbing of sorts?
>
> Thanks
> Joerg
>