domain design in grails for related things

Question

Hi,

using Grails 1.1.1

I have domain in Grails Person. Person can be related to another Person buut they can be stand alone. this is like:

I have A as my friend and A have me as his friend

B can be stand alone (not having friend)

should I type

Person {
 belongsTo = [friend:Person]
 hasMany = [persons:Person]

 constraints {
   friend(nullable:true)
 } 

}

and how to delete A ?

Answer 1

Why do you need the friend property? Don't you just want a person to have zero to many friends?

Person {
 hasMany = [friends:Person]
}