SetTracking Graph Traversal

[tonysneed]

• setTracking method will need to traverse graph to recursively set tracking.
  • Use traverse package to detect cycles.

[omatrot]

Hi @tonysneed.
Is there a particular reason this is not available yet?
I would need that kind of method but it seems not so easy to implement even with a recursive graph iterator. Did you give it a try and posponed it because of your early findings?

[tonysneed]

I haven’t had time to get this package to where I’d like it. Happy to accept PR’s though! :)

[omatrot]

Right now I wrote a utility static class of my own, using the recursive-iterator package:

import { TrackableEntity } from "trackable-entities";
import RecursiveIterator from "recursive-iterator";

export class MySetTrackingHelper {
  public static setTrackingOnObjectGraph(
    e: TrackableEntity,
    on: boolean = true
  ) {
    var iterator = new RecursiveIterator(e, undefined, true);
    for (let { parent } of iterator) {
      if (
        this.getPropertyDescriptor(parent, "tracking") &&
        this.getPropertyDescriptor(parent, "tracking").get != undefined
      ) {
        parent.tracking = on;
      } else {
        continue;
      }
    }
  }
  private static getPropertyDescriptor(
    obj: any,
    prop: string
  ): PropertyDescriptor {
    let desc;
    do {
      desc = Object.getOwnPropertyDescriptor(obj, prop);
    } while (!desc && (obj = Object.getPrototypeOf(obj)));
    return desc;
  }
}

I'd be happy to make a pull request as long as your give me directions on how to restructure this for it to fit in your setTracking implementation.