Yeah, I'm really unclear on how this is being passed around and how the
continuation works. For example, what does this line do:
"id" -> SHtml.hidden({category.id = currentId})
I can see that it adds a hidden field in the form with the value true
and the name of the field some sort of code. I can only presume that
that code tells the snippet, upon submission of the form, that it should
set the category.id to currentId, thus handing the object back to the
snippet. But how does this really work? What creates the code and what
interprets it and recreates the object? I have been unable to figure
this out.
Also, I'm not entirely clear on hibernate. My understanding is that
there is only one copy of any object, so if I pass the id of an object
that already exists to my category, then I am manipulating the real
object. Is that true? So when I "merge," I'm merging changes to that
object into the persisted one?
A problem I'm having because I don't really understand how this works is
that I have a "createdAt" field in my objects which is a timestamp
that's set to now() when the object is created. But everytime I update
the object, it resets that field to a new "now()". And that is true for
other fields as well. I can only guess that the object I'm merging isn't
the same as the object in the database, and the null fields in my "new"
object cause the fields in the database to be changed to the default
values. That's not what I want, but I can't figure out how to get around
it, and I'm not sure how to load the object in the database before
manipulating it. Everything seems to work by magic, and I'm a lousy
magician.
Does any of this make any sense? I've got all this working at the
moment, but thanks to magic. I really am not sure *why* or *how* it is
working. I'd love to have a better understanding of this, but it's an
uphill battle especially given how much I need to get done in how little
time (so not much time for research).
Thanks, BTW, for all your help, Derek. You have basically saved my ass
on this and many other projects and if I can do the same for you anytime
please let me know.
Chas.
Derek Chen-Becker wrote:
> When you go to edit, are you passing the Category to be edited into the
> categoryVar RequestVar? For instance, in your listing code say you had
> something like:
>
> def list (xhtml : NodeSeq) : NodeSeq = {
> Model.createQuery[Category]("from Category").findAll.flatMap({category =>
> <tr>
> <td>{category.name <http://category.name>}</td>
> <td>{Shtml.link("/admin/categories/add", () =>
> categoryVar(category), Text("Edit"))}</td>
> </tr>
> }
>
> Otherwise I don't see in your code where the categoryVar is being
> populated other than the default (new Category()).
>
> Derek
>
>
> On Sat, Oct 11, 2008 at 1:35 PM, Charles F. Munat <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
>
> OK, I tried that. Still no luck. I also went back to just using bind:
>
> <lift:CategoryOps.editor form="POST">
> <category:id />
> <category:name />
> <category:submit />
> </lift:CategoryOps.editor>
>
> And
>
> object categoryVar extends RequestVar(new Category())
> def category = categoryVar.is
>
> def editor(xhtml : NodeSeq) : NodeSeq = {
> def addOrUpdate() = {
> if (category.name.length == 0) {
> error("emptyCategory", "The category's name cannot be blank")
> } else {
> Model.merge(category)
> redirectTo("/admin/categories/")
> }
> }
>
> val currentId = category.id <http://category.id>
>
>
> bind("category", xhtml,
> "id" -> SHtml.hidden({category.id <http://category.id> =
> currentId}),
> "name" -> SHtml.text(category.name <http://category.name>,
> category.name <http://category.name> = _),
> "submit" -> SHtml.submit("Save", addOrUpdate))
> }
>
> Everything works just fine on add, but on update the form is not
> populated because category is a new Category, not the one from the
> database (I checked).
>
> Any ideas?
>
> Chas.
>
>
> Derek Chen-Becker wrote:
> > OK, one thing I see in your code is that your editor snippet is
> emitting
> > the "form" tag. You really shouldn't do it that way. The snippet tag
> > should look like
> >
> > <lift:CategoryOps.editor form="POST" />
> >
> > Otherwise I don't think the action won't get correctly populated. I
> > don't know if that would cause the form elements to not be bound as
> > well, but let's start with that.
> >
> > Derek
> >
> >
> > On Fri, Oct 10, 2008 at 5:36 PM, Charles F. Munat <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>
> > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>> wrote:
> >
> >
> > For example, here is what I get when I go to the categories
> list page
> > (which lists them just beautifully):
> >
> > Hibernate: select category0_.id as id2_, category0_.CREATED_AT as
> > CREATED2_2_, category0_.name as name2_,
> category0_.UPDATED_AT as
> > UPDATED4_2_ from CATEGORIES category0_ order by category0_.name
> > WARN - Snippet Failure: SnippetFailure(/admin/categories/ ->
> > ParsePath(List(admin, categories,
> > index),,true,true),Full(Menu.link),Stateful Snippet:
> Dispatch Not
> > Matched)
> > WARN - Snippet Failure: SnippetFailure(/admin/categories/ ->
> > ParsePath(List(admin, categories,
> > index),,true,true),Full(Menu.link),Stateful Snippet:
> Dispatch Not
> > Matched)
> > INFO - Service request (GET) /admin/categories/ took 28
> Milliseconds
> > INFO - Service request (GET) /ajax_request/liftAjax.js took 1
> > Milliseconds
> >
> > So there are two warnings for each page view.
> >
> > Chas.
> >
> > David Pollak wrote:
> > > You have to define a package for Category.scala
> > >
> > > On Fri, Oct 10, 2008 at 4:00 PM, Charles F. Munat
> <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
> > > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>>> wrote:
> > >
> > >
> > > Thanks, Derek. Actually, I don't use .html or even
> "add" (all
> > my html
> > > files are called index.html -- I use directories to sort
> > them). This
> > > error came when I was experimenting to see if that made a
> > difference.
> > >
> > > That said, I get the error all the time. I don't have val
> > dispatch... in
> > > my snippets. But that's because I copied the JPADemo over,
> > and your
> > > AuthorOps and BookOps don't have the val dispatch
> either. But the
> > > JPADemo doesn't get this error.
> > >
> > > Also, my edit functions don't work -- the forms are
> not populated
> > > properly. I thought I had it working a minute ago, and
> now it
> > isn't
> > > again.
> > >
> > > I switched the snippets around a bit and dropped the bind
> > (because I
> > > wanted to color code alternate rows and wasn't sure
> how to do it
> > > otherwise). Here is an example:
> > >
> > > snippet/Category.scala:
> > >
> > > import scala.xml.{NodeSeq,Text}
> > >
> > > import net.liftweb.http.{RequestVar,S,SHtml}
> > > import net.liftweb.util.Helpers
> > > import S._
> > > import Helpers._
> > >
> > > import Model._
> > >
> > > class CategoryOps {
> > > val formatter = new java.text.SimpleDateFormat("dd
> MMM yyyy")
> > >
> > > def getRowClass(r: Int) = {
> > > if (r % 2 == 0) "even" else "odd"
> > > }
> > >
> > > def list: NodeSeq = {
> > > <tr valign="top" align="left">
> > > <th class="text">Name</th>
> > > <th class="integer">Links</th>
> > > <th class="blank"> </th>
> > > <th class="blank"> </th>
> > > </tr> ::
> > >
> > >
> >
>
> Model.createNamedQuery[Category]("findAllCategories").getResultList().toList.zipWithIndex.flatMap(c
> > > => <tr valign="top" class={getRowClass(c._2)}>
> > > <td class="text">{c._1.name <http://1.name>
> <http://1.name>
> > <http://1.name>}</td>
> > > <td
> class="integer">{SHtml.link("/links/search/", {() =>
> > >
> > WeblinkOps.resultVar(Model.createNamedQuery[Weblink](
> > > "findWeblinksByCategory", "id" -> category.id
> <http://category.id>
> > <http://category.id>
> > > <http://category.id>).getResultList().toList)
> > > }, Text(category.weblinks.size().toString))}</td>
> > > <td class="edit">{SHtml.link("editor", () =>
> > > categoryVar(category), Text("Edit"))}</td>
> > > <td class="delete"> </td>
> > > </tr>)
> > > }
> > >
> > > object categoryVar extends RequestVar(new Category())
> > > def category = categoryVar.is
> > >
> > > def editor (xhtml : NodeSeq) : NodeSeq = {
> > > def addOrUpdate () = {
> > > if (category.name.length == 0) {
> > > error("emptyCategory", "The category's name
> cannot be
> > blank")
> > > } else {
> > > Model.merge(category)
> > > redirectTo("/admin/categories/")
> > > }
> > > }
> > >
> > > val currentId = category.id <http://category.id>
> <http://category.id>
> > <http://category.id>
> > >
> > > <form method="POST" action="">
> > > <table class="editor" border="0" cellpadding="3"
> > cellspacing="0">
> > > <tr valign="top" align="left">
> > > <th>Name</th>
> > > <td>{SHtml.text(category.name
> <http://category.name>
> > <http://category.name> <http://category.name>,
> > > category.name <http://category.name>
> <http://category.name> <http://category.name> =
> > _)}</td>
> > > </tr>
> > > <tr valign="top" align="left">
> > > <th>{SHtml.hidden({category.id
> <http://category.id> <http://category.id>
> > <http://category.id> =
> > > currentId})} </th>
> > > <td>{SHtml.submit("Save", addOrUpdate)}</td>
> > > </tr>
> > > </table>
> > > </form>
> > > }
> > > }
> > >
> > > webapp/admin/categories/editor/index.html:
> > >
> > > <lift:surround with="default" at="content">
> > > <h2>Categories</h2>
> > > <table class="list">
> > > <lift:CategoryOps.list/>
> > > </table>
> > > </lift:surround>
> > >
> > > And in Boot.scala:
> > >
> > > Menu(Loc("categories", List("admin", "categories",
> "index"),
> > > "Categories", LocGroup("admin")),
> > > Menu(Loc("categories_add", List("admin", "categories",
> > "editor",
> > > "index"), "Add a New Category", Hidden))
> > > ),
> > >
> > > ANY suggestions for how to do any of this better greatly
> > appreciated. Do
> > > I need to add the val dispatch... part? If so, why is this
> > different
> > > from the JPADemo?
> > >
> > > Thanks!
> > > Chas.
> > >
> > >
> > > Derek Chen-Becker wrote:
> > > > It means that the dispatch function on whatever
> Stateful
> > Snippet is
> > > > being called isn't matching what you're asking it to
> > provide. For
> > > > instance, if your snippet tag looks like
> > > >
> > > > <lift:MySnippet.add>
> > > >
> > > > Then the dispatchPf in the MySnippet stateful
> snippet has
> > to have a
> > > > dispatch function like:
> > > >
> > > > val dispatch: DispatchIt = {
> > > > case "add" => <some function here> _
> > > > }
> > > >
> > > > See
> > > >
> > >
> >
>
> http://scala-tools.org/mvnsites-snapshots/liftweb/lift-webkit/scaladocs/index.html
> > > > for more details.
> > > >
> > > > I also know that David has recently /strongly/
> recommended not
> > > putting
> > > > ".html" on the ends of things.
> > > >
> > > > Derek
> > > >
> > > > On Fri, Oct 10, 2008 at 3:15 PM, Charles F. Munat
> > <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
> > > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>>
> > > > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
> > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>>>> wrote:
> > > >
> > > >
> > > > What exactly does this mean? I get a lot of these.
> > > >
> > > > WARN - Snippet Failure:
> > SnippetFailure(/admin/users/add.html ->
> > > > ParsePath(List(admin, users,
> add),html,true,false),
> > > > Full(Menu.link),
> > > > Stateful Snippet: Dispatch Not Matched)
> > > >
> > > > What is failing here and what are the probable
> causes?
> > > >
> > > > Thanks.
> > > >
> > > > Chas.
> > > >
> > > >
> > > >
> > > >
> > > > >
> > >
> > >
> > >
> > >
> > >
> > > --
> > > Lift, the simply functional web framework http://liftweb.net
> > > Collaborative Task Management http://much4.us
> > > Follow me: http://twitter.com/dpp
> > > Git some: http://github.com/dpp
> > >
> > > >
> >
> >
> >
> >
> > >
>
>
>
>
> >
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