Hi,

I know I posted many weird JSON problems lastly, but I use JSON a lot, so .. :D

I had a porblem in my application which I managed to replicate after a few hours, but I have to confess it still seems a little weird.

I create a some kind of linked list in cs:

So far everything works as expected, the inner object exists:

{ "id": "inner"}

Now if I cut the chain at the first possible point, the lastof the chain is destroyed:

{ }

So what can I do if a want to reset references to inner json objects without destroying them?

The system currently checks if a json object is referenced by some other json object still and wont recursively delete it if it is. HOWEVER, mere reference from a variable does not protect you.  It would be too expensive to go consult all variables.

In your example, $$outerobject.next points to middleobject, which points to inner object. There are no other references, so you will lose your objects when you delete the reference from outer.  If you want it protected some other json object will have to do that.

Bruce Wilcox - Dec 12, 2016:

If you want it protected some other json object will have to do that.

Thank you very much.
I tested both array and object to store some references:

and

But neither prevents

from deleting innerObject?

If $$outerobject.next points to a “middle” object, ant that middle object contains the inner one, then setting $$outerobject.next to null would logically have to delete the inner object as well, since it’s contained within the middle object, and that got removed by being set to null.

Or maybe I’m missing something, in which case please ignore me.

It worked fine for me…. My test case was this
$$innerobject = ^jsoncreate(object)
$$innerobject.id = inner
$$middleobject = ^jsoncreate(object)
$$middleobject.id = middle
$$middleobject.next = $$innerobject
$$outerobject = ^jsoncreate(object)
$$outerobject.id = outer
$$outerobject.next = $$middleobject

^jsonwrite($$innerobject) 
$$saveJSONObject = ^jsoncreate(object)  —- originally not there in 1st test
^jsonobjectinsert($$saveJSONObject ob $$innerobject) —- originally not there in 1st test

$$outerobject.next = null
^jsonwrite($$innerobject)