Wrong id_field with linked relationships.

Hi,

I have struggled some hours to track this down. The problem is that id_field_alias (in entityreference/views/entityreference_plugin_display.inc) is incorrectly set when relationships are linked (back to the same base table). Example:

AUTHOR (UID) => AUTHORED NODE => LINKED USERS (UID)

where the author UID is a contextual filter (the ID of the currently logged in user). Entity reference module uses "users_uid" instead "users_field_data_somefield_uid".

I have attached a very hackish patch and my exported view.

To reproduce it:

1. Create a content type Family that has one multi-valued field that links to users (which are family members/children).
2. Then create one Family node and link it to two users (which are your children).
3. Create a content type Test that has one field that links to users (your children) and use a view to select the entities in the entity reference list. The view is like the example above.

Result: The select list only shows one user no matter how many children you have, and when you save you have actually added your self.