observable ev.data.observeAll helper broken when path is "*"

johan-ohrn commented 4 years ago

I've stumbled upon what I believe is a bug in the observable API when the path is set to "*".

var arr = [{a:[]}]
$.observe(arr, "[].a", function(e){console.log(e.data.observeAll, e.data.observeAll && e.data.observeAll.parents())})
$.observable(arr[0].a).insert("a")
// output
// undefined undefined

Notice how path is set to [].a observeAll helper object is missing which is consistent with the documentation.

var arr = [{a:[]}]
$.observe(arr, "[].*", function(e){console.log(e.data.observeAll, e.data.observeAll && e.data.observeAll.parents())})
$.observable(arr[0].a).insert("a")
// output
// {_path: "undefined.a", filter: undefined, path: ƒ, parents: ƒ} undefined

Notice how path is set to [].* observeAll helper object is there but its internal data seem to be corrupt. _path contains "undefined" and the .parents() method returns undefined. I'm not expecting the helper object because I'm not using a deep path, i.e. **.

var arr = [{a:[]}]
$.observe(arr, "[].**", function(e){console.log(e.data.observeAll, e.data.observeAll && e.data.observeAll.parents())})
$.observable(arr[0].a).insert("a")
// output
// {_path: "root.a", filter: undefined, path: ƒ, parents: ƒ} [{…}]

Notice how path is set to [].** observeAll helper object is there and it's working. .parent() method returns correct object.