Hi Tim,
The only reason why I reported this as an error is because my attempts to
use CRUDify in this way resulted in compile errors. If Transaction is using
CRUDify, then Transaction.menus returns List[Menu]. Hence, the example
effectively does this:
List[Product] = Menu :: List[Menu] :: Nil
Since SiteMap accepts a vararg array of Menu*, turning the List[Product]
into an array places the whole List[Menu] in the second position. For
example, with this code...
val menu = Menu(Loc("Home", List("index"), "Home")) :: Project.menus ::
Nil
LiftRules.setSiteMap(SiteMap(menu:_*))
I get this compile error:
[INFO] found : List[Product]
[INFO] required: Seq[net.liftweb.sitemap.Menu]
[INFO] LiftRules.setSiteMap(SiteMap(menu:_*))
You are correct that simply changing the :: to ::: will not work (I
oversimplified because I have many CRUDify menus). If you remove the "::
Nil" from the above line of code, all is well. Subsequent CRUDify menus
then need to be appended using ::: to merge the list, or the list could
probably be flattened just before passing to the SiteMap. As written, the
example doesn't work for me. I am using Lift 1.0 in my prototyping.
On Mon, Mar 9, 2009 at 4:23 AM, Timothy Perrett <[email protected]>wrote:
>
>
> >
> > I believe the typo is in listing 6.36, shown below.
> >
> > val menus = ... Menu(Loc(...)) :: Transaction.menus :: Nil
> > LiftRules.setSiteMap(SiteMap(menus : _*))
> >
> > This should be using the ::: operator instead of :: because the CRUDify
> > menus are returned as Lists. Using the :: would assign a List[Product]
> > instead of the required Seq[Menu].
>
> James,
>
> This is not an error - the difference between :: and ::: is that ::
> appends the new item to the given List[T] and ::: prepends to the
> given List[T]
> If you would like to know more about sitemap check out:
>
> http://wiki.liftweb.net/index.php?title=SiteMap
>
> Cheers, Tim
> >
>
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