Rails - Nov 2007 - acts_as_tree "soft destroy", ie. "move up" children

By default, when you destroy a parent node all of the children nodes
are destroyed as well.

Is there a way I can modify this so that when you destroy a parent
node all the children nodes are simply "moved up" within the tree?

Thanks!
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come to think of it, I should probably just create my own function
called destroy_and_move_up or something =P

On Nov 15, 1:04 pm, Stedwick
<philip.broc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> By default, when you destroy a parent node all of the children nodes
> are destroyed as well.
>
> Is there a way I can modify this so that when you destroy a parent
> node all the children nodes are simply "moved up" within the
tree?
>
> Thanks!
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put it in the before_destroy callback of the model
-- 
Posted via http://www.ruby-forum.com/.

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I tried that already.

def before_destroy
self.children.each {|child|
  child.parent_id = nil
  child.save
}
end

(Yeah, I know, it doesn''t "move them up", it just sets them
to new
root nodes)

However, rails won''t let me do that.  It says I can''t modify a
frozen
hash. I''m not sure what that means, but I assume it means I
can''t
modify things that are about to be destroyed.

On Nov 15, 1:35 pm, Thorsten Muller
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> put it in the before_destroy callback of the model
> --
> Posted viahttp://www.ruby-forum.com/90.
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> > put it in the before_destroy callback of the model

I tried using the before_destroy for a similar purpose - I wanted to
stop deletion if the node has children.  But I ran into trouble, the
children were destroyed anyway.  From what I have read elsewhere in
this group, I believe the before_destroy is only called after
dependent_destroy is actioned.  That may be what is happening here.

Seems to me to write a seperate method may be the way to go.

Tonypm
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