Either joins with has_many through association

[VSidhArt]

Issue:

When using either_joins/2 with has_many through association, the query fails, because in where condition used final table name, not 'through' table

Solution

In method xor_field_options_for_associations if reflection.through_reflection? use 'through' reflection

[GeorgeKaraszi]

Hey sorry for radio silence, been on vacation for past couple of weeks.

Thanks for this addition and AFAIK this look pretty good 👍