#25606: field_paths do not work in list_filter when using
RelatedOnlyFieldListFilter
-------------------------------+--------------------
     Reporter:  quarkness      |      Owner:  nobody
         Type:  Bug            |     Status:  new
    Component:  contrib.admin  |    Version:  1.8
     Severity:  Normal         |   Keywords:
 Triage Stage:  Unreviewed     |  Has patch:  1
Easy pickings:  0              |      UI/UX:  0
-------------------------------+--------------------
 Given this ModelAdmin:

 {{{
 class BookAdminRelatedOnlyFilter(admin.ModelAdmin):
     list_filter = (
         'edition__publisher',
         ('edition__publisher', RelatedOnlyFieldListFilter),
     )
 }}}


 The first filter works fine, but the second results in a FieldError:
 Cannot resolve keyword 'publisher' into field.

 The reason this happens is because RelatedOnlyFieldListFilter uses
 field.name instead of the field_path, where field is the result of
 get_fields_from_path, which returns the 'publisher' field

 This patch fixes this behaviour:
 https://github.com/django/django/compare/master...quarkness:related-only-
 filter-field-path
 It also improves performance by using .distinct() on the database to get
 unique values instead of set()

--
Ticket URL: <https://code.djangoproject.com/ticket/25606>
Django <https://code.djangoproject.com/>
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