I’m reading through this primer on Permission Models which discusses a basic model of

User

,

Document

, and

Folder

. There’s a small section on refactoring (link). However, I can’t seem to make sense of this:

view: (ctx: Context): boolean =>
    this.related.viewers.includes(ctx.subject) ||
-   this.related.editors.includes(ctx.subject) ||
-   this.related.owners.includes(ctx.subject) ||
-   this.related.parents.traverse((parent) => parent.permits.view(ctx))
+   this.permits.edit(ctx)

If we drop

this.related.parents.traverse((parent) => parent.permits.view(ctx))

, how can a user inherit

view

access from the parent

Folder

?