On 23.03.2017 11:56, paul wrote:
Suppose I have two Classes, one extending the other:
class Person{ String name, int age}
class Pupil extends Person {int grade}
Now to manage several Persons in a List, and add some custom methods, I
use the @Delegate like
class Personlist{
@Delegate List<Person> persons
Personlist underAge(n){persons.findAll{it.age<=n} as Personlist}
}
Pupillist should have the same methods (since each pupil is a person):
class Pupillist extends Personlist{
Pupillist inGrade(g){persons.findAll{it.grade==g} as Pupillist}
}
Now I want to chain several of these methods like this:
def pl = [...] as Pupillist
pl.underAge(12).inGrade(9)
throws a MissingMethodException, because `pl.underAge` gets cast into a
Personlist, which has no method `inGrade`.
How about not working with Delegate and instead use a category for the
methods and just return a list?
bye Jochen
