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])
>
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