I need to add some data to my link model that isn’t used by the diagram link template. This data is needed later and I thought to use _ to mark it as extra data not used by the template. Here is a simple example:
model.addLinkData({
a: a,
b: b,
_c: c
})
Later in a ChangedEvent I want to access _c after doing this:
const { model } = event;
const changes = JSON.parse(model.toIncrementalJson(event));
const modified = changes.modifiedLinkData || [];
In the debugger model.linkDataArray has the _c property in it but changes.modifiedLinkData doesn’t. Doing a model.toIncrementalJson(event) looks to not include any property with a _. If I change my code to ABC: c then it works just fine.
So does model.toIncrementalJson() purposely ignore any properties with an _? If so is there a recommened way to store data into a link model that isn’t used by the template?