Feeds support

Problem/Motivation

The Feeds module doesn't see Primary Entity Reference Fields so it is not possible to import data to a field of this type.

Steps to reproduce

Proposed resolution

Create a Feeds Target Plugin (extend Drupal\feeds\Feeds\Target\EntityReference ) to

• Provide functionality equivalent to that of core Entity Reference
• Provide a way to target the primary item
• Provide a way to set the primary bool for an item

Remaining tasks

User interface changes

API changes

Data model changes