Relation field with list widget

[afunnydev]

- Do you want to request a feature or report a bug?
Feature
- What is the current behavior?
The relation widget can look for fields in collection.

- What is the wanted behavior?
It would be nice if it could also look into the "subfields" of a list field in a collection.
For example, I have a collection named "catalog", which contain a list field named "product", and this field as 3 fields: id, name and author. It would be awesome to be able to be able to use id, name and author in searchFields or valueField to retrieve the "subfields" of this list field.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[barthc]

This is now supported, you can do:
searchFields: ['list.0.title'] and
valueField: '{{fields.list[0].title}}'

We still need to document though. I also think we should make the access path more consistent.