Because it's type erasure I don't think I can do a generic "new" inside the
methods, but the findOne method does return a Can. That means that you were
actually pretty close in your demo code. Here's what it could look like:
val user: User =
Model.createNamedQuery[User](
"findUserByUsername",
"username" -> "hal"
).findOne or (new User)
Derek
On Mon, Dec 1, 2008 at 2:24 AM, Charles F. Munat <[EMAIL PROTECTED]> wrote:
>
> That will probably work. I was thinking it would be nice to build in a
> method findOrNew that would do it for me... but it looks like that might
> involve some sort of implicit manifest thingy, so I don't know.
>
> Chas.
>
> Viktor Klang wrote:
> >
> >
> > On Mon, Dec 1, 2008 at 7:12 AM, Charles F. Munat <[EMAIL PROTECTED]
> > <mailto:[EMAIL PROTECTED]>> wrote:
> >
> >
> > Is there a simple way in JPA/Lift to query to retrieve a single
> object
> > from the database, assign it to a val if found, or create a new
> object
> > of that type and assign it instead of there is no such object in the
> > database?
> >
> > Sort of a...
> >
> > val user: User =
> > Model.createNamedQuery(
> > "findUserByUsername",
> > "username" -> "hal"
> > ).findOr(new User())
> >
> >
> > (Can ! (yourQuery.uniqueResult)).openOr(new User())
> >
> > Should work?
> >
> >
> >
> > or something like that? That would be very useful.
> >
> > Thanks,
> > Chas.
> >
> >
> >
> >
> >
> > --
> > Viktor Klang
> > Senior Systems Analyst
> >
> > >
>
> >
>
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