[Betternestedset-talk] Sortable Sets

[Krishna Dole]

Just in case you hadn't seen them, BNS has all the ordering methods of
ActsAsList, and a method for swapping 2 nodes in a single operation.
This should be everything you need for sorting, correct?

Krishna

On Wed, Mar 19, 2008 at 4:23 PM, Jeremy Nicoll <jnicoll at gnexp.com> wrote:
>
>  Oh, I think I know what you are saying now.  Actually, it's a bit more
> hairy than that because with nested sets, the order is determined by the
> "lft" column. You cannot change this column directly, as ANS (and as such,
> BNS) uses this to keep track of where everything belongs. If you don't care
> about the ordering of the children when retrieved by the BNS methods then
> you might be able to do the method that you are thinking.  Something to
> consider.
>
>
>
>
>
>
>  Jeremy Nicoll
>  www.gnexp.com
>  (801) 783-3831
>
>  John-Paul Bader wrote:
>
> Well I think actually these are two seperate functions. One function is to
> put nodes on different positions in the tree and the other one would be
> ordering the nodes within a parent node. Tomorrow at work I'll try that
> approach and let you know how it went.
>
>
> Kind regards, John
>
>
>
> On 19.03.2008, at 23:04, Jeremy Nicoll wrote:
>
>
>      No thoughts at the moment, but if you run into any problems I'll see if
> I can help you.  FYI, I have not used the two components that you are using
> together - mostly I've just used better_nested_set.  Ordering things in a
> list is pretty easy and so I've always just done my own code because I've
> felt the other helpers just get in my way.
>
>
>
>  <logo_sig.jpg>
>  Jeremy Nicoll
>  www.gnexp.com
>  (801) 783-3831
>
>  John-Paul Bader wrote:
>
> After lots of reading I think the best way is to use simple draggables and
> droppables. After the drop i'll move the dragged node to the dropped one
> with move_to_child_of and after that i'll redraw the tree.
>
>
> Any thoughts on that ?
>
>
> Kind regards, John
>
> On 19.03.2008, at 20:45, Jeremy Nicoll wrote:
>
>
>  Hello John-Paul,
>
>      I've done this in a recent project.  Basically the way I do it is check
> to see what order the a selected item in a list is in, and then move that
> item before/after a child node in the target parent based off this
> information.  It's a bit complicated, but it's doable. I monkey patched the
> module SymetrieCom::Acts::NestedSet to include the following method to help
> me with this scenario:
>
>  ________________________________
>         def move_to_parent_location(parent, location)
>            parent = nil if parent == 0
>            parent = parent === self.class ? parent : self.class.find(parent)
> if parent
>            children = parent ? parent.children : self.class.roots
>
>            if children.length > 0
>              ord = location.to_i
>              if ord > children.length
>                self.move_to(children.last, :right)
>              elsif children[ord] != self
>                self.move_to(children[ord], :left)
>              end
>            elsif parent
>              self.move_to(parent, :child)
>            end
>          end
>  ________________________________
>
>
>
>
>  <logo_sig.jpg>
>  Jeremy Nicoll
>  www.gnexp.com
>  (801) 783-3831
>
>  John-Paul Bader wrote:
>  Hey there,
>
> I just subscribed so i hope this question isn't redundant.
>
> I'm trying to implement a sortable nested set.
>
> I've already got an application with better_nested_set in place. I
> also got a nice nested <ul> rendering for my tree. No I'd be able to
> drag an drop / sort elements across the set.
>
> I found this Wiki entry which says that it wouldn't be a good idea in
> general to use sortable.create with :tree => true
>
> http://whynotwiki.com/Rails_/_Sortable_trees
>
> On the same page there is a link to the rubyonrails wiki stating that
> there is a fix expecially for better_nested_set.
> http://dev.rubyonrails.org/ticket/7807
>
> My question would be what your experiences are. Is there a good way to
> implement a sortable / draggable better_nested_set ? If not do you
> have any suggestions, thoughs on this ?
>
> Thanks and kind regards,
>
> John (Berlin / Germany)
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