I have been working on a lightning:treeGrid for the last while. Although the data is definitely getting through to the browser (I can see the child array in the console), I cannot get the tree to expand and show the child data.
I am having to use a wrapper class, because the child record is a case, whereas the parent record is a custom object, and although they are related to each other they share no fields.
Does anybody know if this can work? Or does the relationship between objects need to be a clear parent-child relationship?