Well, I managed to upload to github. Here is the repository: git://github.com/glennSilverman/UserMon.git
Any feedback is appreciated. Glenn... On Aug 25, 10:43 am, Naftoli Gugenheim <[email protected]> wrote: > Google code? Sourceforge? ProjectLocker? > There are a lot of choices... > > On Tue, Aug 25, 2009 at 12:37 PM, glenn<[email protected]> wrote: > > > I have a working example of ManyToMany that adds roles to users. I > > would be happy to share my work > > but I have an aversion to github. I don't like it, It's a slower-than- > > molasses interface. It's buggy and user-hostile > > in my opinion. I'm looking for an alternative to make it public. Any > > suggestions would be appreciated. > > > Glenn... > > > On Aug 25, 7:08 am, Naftoli Gugenheim <[email protected]> wrote: > >> "This" meaning the problem, or meaning ManyToMany? > >> It's pretty simple to use. You're mapper should extend ManyToMany, and you > >> should have a "field": > >> object m2m extends MappedManyToMany(.../*the two MetaMappers and foreign > >> keys, see the docs/source*/) > >> Then you can treat m2m as a Buffer, adding and deleting children. Call > >> save on the mapper or m2m to propogate the adding/deleting to the > >> database, and refresh to reset its contents to reflect the database. > >> However, as noted currently the children must be saved before they are > >> added. This is not the case for OneToMany, and for ManyToMany it should > >> not be a problem because usually the children exist independently of the > >> parent--that's why they can have 0 or 1 or more "parents." > > >> ------------------------------------- > > >> Randinn<[email protected]> wrote: > > >> Anyone have code showing this in action as it were? > > >> On Aug 6, 8:39 am, Naftoli Gugenheim <[email protected]> wrote: > > >> > Oh, I think I know what the problem is. I think I should classify it as > >> > a bug. > >> > Since you're adding a Role that isn't saved yet, and ManyToMany tracks > >> > the children via the join table, it can't access the child. As a > >> > workaround save the Role before adding it, although the need to do so is > >> > against the idea of ManyToMany and OneToMany. I will see what I can do, > >> > G-d willing. > > >> > ------------------------------------- > > >> > glenn<[email protected]> wrote: > > >> > Naftoli, > > >> > Hate to do this to you, but I'm getting the following error using > >> > ManyToMany for Users to Roles: > > >> > Message: java.lang.RuntimeException: Broken join > >> > scala.Predef$.error(Predef.scala:76) > >> > > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany$$anonfun$children$1$ > >> > $anonfun$apply$1.apply(ManyToMany.scala:54) > >> > > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany$$anonfun$children$1$ > >> > $anonfun$apply$1.apply(ManyToMany.scala:54) > >> > net.liftweb.util.EmptyBox.openOr(Box.scala:372) > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany$$anonfun$children > >> > $1.apply(ManyToMany.scala:54) > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany$$anonfun$children > >> > $1.apply(ManyToMany.scala:54) > >> > scala.List.map(List.scala:812) > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany.children > >> > (ManyToMany.scala:54) > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany.elements > >> > (ManyToMany.scala:96) > >> > scala.Seq$class.flatMap(Seq.scala:293) > >> > net.liftweb.mapper.ManyToMany$MappedManyToMany.flatMap > >> > (ManyToMany.scala:44) > > >> > def edit(ns: NodeSeq): NodeSeq = { > >> > val theUser = view.entity > >> > val addRole = TheBindParam("insert", view.snippet.link("edit", () > >> > => theUser.roles += new Role, Text(S?("Add Role")))) > > >> > bind("user", ns, > >> > "firstname" -> text(theUser.firstName.is, theUser.firstName > >> > (_), ("size","20")), > >> > "lastname" -> text(theUser.lastName.is,theUser.lastName(_), > >> > ("size", "30")), > >> > "roles" -> theUser.roles.flatMap{role => > >> > bind("role", ns, > >> > "name" -> role.name.toForm, > >> > "remove" -> SHtml.submit(S?("Remove"), ()=> > >> > theUser.roles -= role) > >> > ) > >> > }, > >> > addRole, > >> > "submit" -> SHtml.submit(S?("Save"), ()=>view.save) > >> > ) > >> > } > > >> > The offending code seems to be the line: "roles" -> > >> > theUser.roles.flatMap{.... > >> > in the above bind method when I click on the addRole link. > > >> > Here's my User class: > > >> > class User extends MegaProtoUser[User] with ManyToMany[Long,User]{ > >> > def getSingleton = User // what's the "meta" server > > >> > object roles > >> > extends MappedManyToMany(UserRole, UserRole.user, UserRole.role, > >> > Role) > > >> > } > > >> > What am I doing wrong? You can see how difficult it is to slog through > >> > this code, let alone just > >> > trying to explain the problem so I can get help. > > >> > On Aug 5, 9:57 am, Naftoli Gugenheim <[email protected]> wrote: > > >> > > I'll try. > >> > > By the way, as per my correction, you can implement list the regular > >> > > way without ModelView, and just use ModelSnippet's load function in > >> > > your edit link or button, passing it the User instance. > > >> > > ------------------------------------- > > >> > > glenn<[email protected]> wrote: > > >> > > Naftoli, > > >> > > I fixed my code per your comments and now I can edit and remove users > >> > > from a list, as long as I populate the list with > >> > > ModelView instances, as you said. As for the docs, this step was not > >> > > clear to me at all. I just assumed that the list was > >> > > just populated with User entities and the view in the ModelSnippet was > >> > > instantiated with the selected User on each request. > > >> > > It sounds like your plate is pretty full, so I won't expect much, but > >> > > sometime soon, could you provide an example, or improved > >> > > docs, for using TableEditor and its related ItemsList trait. > > >> > > Thanks for all. > > >> > > Glenn... > > >> > > On Aug 5, 9:18 am, Naftoli Gugenheim <[email protected]> wrote: > > >> > > > Correction: ModelSnippet.load takes the actual Mapper instance, not > >> > > > the ModelView wrapper. > > >> > > > ------------------------------------- > > >> > > > Naftoli Gugenheim<[email protected]> wrote: > > >> > > > To answer your immediate question, the listing should not refer to > >> > > > the snippet's view but new ModelView instances for each entity. Then > >> > > > editAction is shorthand for the snippet's link method with a > >> > > > callback to call load on the ModelView. To set the snippet's view's > >> > > > entity, either call load on the snippet with the other ModelView, or > >> > > > call load on the other ModelView (or just set its entity directly). > >> > > > As far as documentation, please tell me what scaladocs need what > >> > > > clarification. Thanks. > > >> > > > ------------------------------------- > > >> > > > glenn<[email protected]> wrote: > > >> > > > Naftoli, > > >> > > > Functional programming systems are notoriously difficult to document. > >> > > > The only way to really know what's going on is to meticulously trace > >> > > > through the source. But that requires > >> > > > time-consuming trial and error coding. So, without clear examples > >> > > > demonstrating exactly what you have in mind, I and others in the same > >> > > > boat, could spend days and still not > >> > > > get it right. > > >> > > > For example, I tried this: > > >> > > > var theUser:User = null > >> > > > val view = new ModelView(theUser, this) > > >> > > > def list(ns: NodeSeq): NodeSeq = User.currentUser.map({user => > >> > > > User.findAll.flatMap({u => > >> > > > bind("user", chooseTemplate("user", "entry", ns), > >> > > > "firstname" -> Text(u.firstName.is), > >> > > > "lastname" -> Text(u.lastName.is), > >> > > > "email" -> Text(u.email.is), > >> > > > "roles" -> u.roles.map(_.name.toString).mkString(", > >> > > > "), > >> > > > view.editAction, > >> > > > view.removeAction > >> > > > ) > >> > > > }) > >> > > > }) openOr Text("You're not logged in") > > >> > > > and, I get a null value exception when I try to remove a user in the > >> > > > list. Simply using > >> > > > val view = new ModelView(new User, this), doesn't work either, > >> > > > although I don't get an > >> > > > exception. Now, where should I be calling load in all of this? > > >> > > > Glenn... > > >> > > > On Aug 3, 6:22 pm, Naftoli Gugenheim <[email protected]> wrote: > > >> > > > > Your snippet should extend ModelSnippet (which extends > >> > > > > StatefulSnippet). > >> > > > > Then write: > >> > > > > val view = new ModelView(new User, this) {} > >> > > > > Calling load on another ModelView that references the snippet will > >> > > > > load its entity into that view val. It has a number of methods of > >> > > > > possible interest, like save which checks validity. > >> > > > > Also see Util. > >> > > > > Are you seeing the scaladocs? > > >> > > > > ------------------------------------- > > >> > > > > glenn<[email protected]> wrote: > > >> > > > > Just to add to what I just wrote, I don't see how your ModelView > >> > > > > can > >> > > > > be applied to > >> > > > > User, which already extends a class, MegaProtoUser. Maybe I'm not > >> > > > > comprehending this correctly. > > >> > > > > Glenn... > > >> > > > > On Aug 3, 3:48 pm, glenn <[email protected]> wrote: > > >> > > > > > Naftoli, > > >> > > > > > Liked your OneToMany article, but not sure how the new > >> > > > > > ModelView and ModelSnippet code can be applied to ManyToMany. > >> > > > > > Can you provide a sample? > > >> > > > > > Glenn... > > >> > > > > > On Aug 2, 1:21 pm, Naftoli Gugenheim <[email protected]> > >> > > > > > wrote: > > >> > > > > > > I put an article on the wiki about OneToMany > >> > > > > > > --http://wiki.github.com/dpp/liftweb/how-to-work-with-one-to-many-relat... > >> > > > > > > . > > >> > > > > > > On Sun, Aug 2, 2009 at 11:20 AM, Naftoli > > ... > > read more » --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Lift" group. 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