Rails - Apr 2008 - Relating to records in same table

I''m in progress of making a little folder system with Ruby on Rails.
I''ve got a "folders" table. Each "folder" has got
an id and a folder_id.
The folder_id is supposed to represent the folders'' parent folder.

How can I tell Rails?

I would like Rails to automaticly delete all subfolders of a folder when
I delete the folder it self.

Any ideas?
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David Trasbo wrote:
> I''m in progress of making a little folder system with Ruby on
Rails.
> I''ve got a "folders" table. Each "folder" has
got an id and a folder_id.
> The folder_id is supposed to represent the folders'' parent folder.
> 
> How can I tell Rails?
> 
> I would like Rails to automaticly delete all subfolders of a folder when
> I delete the folder it self.
> 
> Any ideas?
acts_as_tree ; see 
http://dev.rubyonrails.org/browser/plugins/acts_as_tree

Stephan

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On 18 Apr 2008, at 09:48, David Trasbo wrote:
>
> I''m in progress of making a little folder system with Ruby on
Rails.
> I''ve got a "folders" table. Each "folder" has
got an id and a
> folder_id.
> The folder_id is supposed to represent the folders'' parent folder.
>
> How can I tell Rails?
As has been pointed out, acts_as_tree does this sort of thing. More  
generally you can do something like

belongs_to :parent, :foreign_key => ''folder_id'',
:class_name => ''Folder''
has_many :children  :foreign_key => ''folder_id'',
:class_name => ''Folder''
>
>
> I would like Rails to automaticly delete all subfolders of a folder  
> when
> I delete the folder it self.
You can use the :dependent option to control that

Fred

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Frederick Cheung wrote:
>> How can I tell Rails?
> As has been pointed out, acts_as_tree does this sort of thing. More
> generally you can do something like
> 
> belongs_to :parent, :foreign_key => ''folder_id'',
:class_name => ''Folder''
> has_many :children  :foreign_key => ''folder_id'',
:class_name => ''Folder''
Thank you, it works perfectly.
>> I would like Rails to automaticly delete all subfolders of a folder  
>> when
>> I delete the folder it self.
> You can use the :dependent option to control that
OK, it works too.

Thanks.
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