Keystone-classic: Sort by relationship always sorts by _id of related field even though name is rendered in admin UI

[steevsachs]

Expected behavior

When sorting by a relationship field, the sort should be alphabetical by the string that is actually rendered in the admin UI.

Actual/Current behavior

Currently the support appears to be alphabetical by the ObjectId.toString() value of the related document's _id property.

Steps to reproduce the actual/current behavior

1. Create two Lists and include a String name property on each.
2. Create relationship between one List and the other (many: false) and set defaultSort on the relationship owner to the property name of the relationship.
3. Create a number of documents for the related List with various name values.
4. Access the admin ui for that List and observe the sort.

Environment

| Software | Version
| ---------------- | -------
| Keystone | 4.0.0-beta.5
| Node | 7.6.0

[layonthebeech]

Did you ever figure this out?

[savager]

I did not.