programmatically setting the `type` of an abstract type

Question

class MyModel(var username:String, var password:String) extends FrameworkModel 

object MyModelQuery extends FrameworkQuery { 
  type T = MyModel 
} 

trait FrameworkQuery { 
type T 
//do something with that type 
}

So I get a class and an object where the latter is mixing in a trait which is defined as an abstract type. Is there a way I could programmatically set the type to the type of MyModel class, so the client would not need to? ie "object MyModelQuery extends FrameworkQuery" would take care of it

Answer 1

trait T{
    type X = this.type
    def x: X = this
}
object A extends T{
    def b = "Yep"
}    
scala> A.x.b
res0: java.lang.String = Yep

Answer 2

Could you achieve a similar effect by just nesting the query in the model?

trait FrameworkModel {
  val model = this
  trait FrameworkQuery {
    type T = model.type
    def getModel: T = model
  }
}

class UserModel extends FrameworkModel {
  // model stuff...
  object UserQuery extends FrameworkQuery {
    // query stuff... 
  }
}