How to avoid recursive linking to a node

GoJS
1

I have a scenario only “to” or “from” can be done from 1 to 1 relationship. Refer bellow image. Here six and seven have recursive links. I just want to avoid 1 link either “to” or “from” can be done. if i have done to then you can’t do from.
Capture

I have tried below code but this is not useful.
this.diagram.validCycle = go.Diagram.CycleDestinationTree;

Reger below image - this is not working with above code.
Capture2

2

As shown at GoJS Validation -- Northwoods Software, which also sets Diagram.validCycle to go.Diagram.CycleDestinationTree, I think it does what you want. Did you not observe any change in what links the user could draw between before and after setting that validCycle property?

3

Hi walter, Thanks for your quick reply, but i have mentioned it in my query right. Refer my 2nd image i have connected two to four and three to four. But with ValidCycle Which is not possible. Please let me know if i misunderstood.

4

this.diagram.validCycle = go.Diagram.CycleNotUndirected; resolved the issue , Thanks Walter :)