how to limit children ?

[webafra]

hello .

i need help to limit children tree

i want to add 1 children tree level in parent . for example :

this is Ok :

-parent 1 
  --child 1-1
  -- child 1-2

this is not ok :

-parent 1 
  --child 1-1
    ---- child 1-1-1

limit user to not add child 1-1-1

please help me .

[wuyuedefeng]

when insert a object as child, you can write A logical judge whether it can mounted. if not, don't assign the child data.

[webafra]

@wuyuedefeng i'm sorry , i'm not understand your idea !