My ultimate goal would be to only pull out the top x users. I'm currently using the following code to achieve this:
TagUser.findAll(By(TagUser.tag, this.id)).map(_.user.obj.open_!) .sort(_.followers_count.is > _.followers_count.is) .take(x) But im concerned that this creates an instance for each of the users in tag tag even though i only need the top x. Thanks for helping me out :) On Jan 5, 1:47 am, David Pollak <feeder.of.the.be...@gmail.com> wrote: > On Mon, Jan 4, 2010 at 3:24 PM, Mads Hartmann <mads...@gmail.com> wrote: > > Hello, I'm having a problem and I'm sure it's an easy fix for someone > > with a bit more experience > > > I have 3 model classes: tag, user, tweet and a join class TagUser. A > > tag has a list of users. > > > If i want all of the users in a tag i use the following code (which > > works): > > > def users = TagUser.findAll(By(TagUser.tag, this.id)).map > > (_.user.obj.open_!) > > > my problem is that i can't figure out how to apply queryparams so i > > don't pull out all of the users from the DB if i don't need em. I was > > thinking something like this (doesn't compile): > > > def getTopUsers(in: Int) :List[User] = { > > TagUser.findAll(By(TagUser.tag, this.id), > > OrderBy(User.followers_count, Descending), > > MaxRows(in)) > > There is an issue: > > OrderBy(User.xxxx, Descending) // illegal... you can only order by a > TagUser.xxx field > > And a potential issue: > > MaxRows[TagUser](in) // sometimes the Type Inferencer doesn't get it right. > > What's your ultimate goal? > > > > > > > } > > > I get the following error: > > [ERROR] ... error: overloaded method value findAll with alternatives > > (net.liftweb.mapper.QueryParam[scalableKvidr.model.TagUser]*)List > > [scalableKvidr.model.TagUser] <and> ()List > > [scalableKvidr.model.TagUser] cannot be applied to > > (net.liftweb.mapper.Cmp > > [scalableKvidr.model.TagUser,Long],net.liftweb.mapper.OrderBy > > [scalableKvidr.model.User,Int],net.liftweb.mapper.MaxRows[Nothing]) > > > -- > > > You received this message because you are subscribed to the Google Groups > > "Lift" group. > > To post to this group, send email to lift...@googlegroups.com. > > To unsubscribe from this group, send email to > > liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com > > > > > . > > For more options, visit this group at > >http://groups.google.com/group/liftweb?hl=en. > > -- > Lift, the simply functional web frameworkhttp://liftweb.net > Beginning Scalahttp://www.apress.com/book/view/1430219890 > Follow me:http://twitter.com/dpp > Surf the harmonics -- You received this message because you are subscribed to the Google Groups "Lift" group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/liftweb?hl=en.