Rails - Oct 2005 - acts_as_tree parent id problem

Hi all,

I have a simple Category model which acts_as_tree.

In the form partial, I use a select form helper to display all the 
categories so that the user can choose a parent category.  This works 
fine, but when I submit the form, I get an AssociationTypeMismatch

It seems that the parent id that I pass back into the controller is 
being treated as a String, rather than finding the appropriate category 
and using that.

I''m using the scaffolding at the moment, so the code looks like:

@category = Category.new(params[:category])

I know that there must be a way of easily assigning all the values in 
the params hash, and looking up the correct parent, without labouriously 
assigning each value manually ie

@category.name = params[:category][:name]
...
@category.parent = Category.find(params[:category][:parent]
...
...

So any ideas?

Kev

Kev Jackson wrote:
> I have a simple Category model which acts_as_tree.
> 
> In the form partial, I use a select form helper to display all the 
> categories so that the user can choose a parent category.  This works 
> fine, but when I submit the form, I get an AssociationTypeMismatch
> 
> ...
> @category.parent = Category.find(params[:category][:parent]
The method parameter for your parent category select helper should be
:parent_id rather than :parent.

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