0001-Review-suggestions.patch

From a7e3b566f5cfdc8a8685cb38e3709c46c42fcb9d Mon Sep 17 00:00:00 2001
From: Johannes Hoppe <info@johanneshoppe.com>
Date: Thu, 31 Oct 2019 14:20:25 +0900
Subject: [PATCH] Review suggestions

---
 django/contrib/admin/static/admin/js/autocomplete.js |  3 ++-
 django/contrib/admin/views/autocomplete.py           |  9 +++------
 django/contrib/admin/widgets.py                      | 10 +++++-----
 tests/admin_views/test_autocomplete_view.py          |  2 +-
 tests/admin_widgets/test_autocomplete_widget.py      |  9 +++++----
 5 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/django/contrib/admin/static/admin/js/autocomplete.js b/django/contrib/admin/static/admin/js/autocomplete.js
index 65c0702dd9..10d6e9bb16 100644
--- a/django/contrib/admin/static/admin/js/autocomplete.js
+++ b/django/contrib/admin/static/admin/js/autocomplete.js
@@ -6,7 +6,8 @@
                 data: function(params) {
                     return {
                         term: params.term,
-                        page: params.page
+                        page: params.page,
+                        _to_field: $element.data('django-to-field')
                     };
                 }
             }
diff --git a/django/contrib/admin/views/autocomplete.py b/django/contrib/admin/views/autocomplete.py
index 5d7f64ca13..d22f71a261 100644
--- a/django/contrib/admin/views/autocomplete.py
+++ b/django/contrib/admin/views/autocomplete.py
@@ -25,12 +25,9 @@ class AutocompleteJsonView(BaseListView):
             return JsonResponse({'error': '403 Forbidden'}, status=403)
 
         self.term = request.GET.get('term', '')
-        self.to_field = request.GET.get('to_field', None)
-        if self.to_field:
-            if not self.model_admin.to_field_allowed(request, self.to_field):
-                raise DisallowedModelAdminToField("The field %s cannot be referenced." % self.to_field)
-        else:
-            self.to_field = 'pk'
+        self.to_field = request.GET.get('_to_field', self.model_admin.model._meta.pk.name)
+        if not self.model_admin.to_field_allowed(request, self.to_field):
+            raise DisallowedModelAdminToField("The field %s cannot be referenced." % self.to_field)
 
         self.object_list = self.get_queryset()
         context = self.get_context_data()
diff --git a/django/contrib/admin/widgets.py b/django/contrib/admin/widgets.py
index ab8354767f..80fbeec6c5 100644
--- a/django/contrib/admin/widgets.py
+++ b/django/contrib/admin/widgets.py
@@ -393,12 +393,11 @@ class AutocompleteMixin:
         self.db = using
         self.choices = choices
         self.attrs = {} if attrs is None else attrs.copy()
-        self.to_field = self.rel.field.to_fields[0] if hasattr(self.rel.field, 'to_fields') else None
+        self.to_field = getattr(self.rel, 'field_name', self.rel.model._meta.pk.name)
 
     def get_url(self):
         model = self.rel.model
-        url = reverse(self.url_name % (self.admin_site.name, model._meta.app_label, model._meta.model_name))
-        return url if not self.to_field else url + '?to_field=' + self.to_field
+        return reverse(self.url_name % (self.admin_site.name, model._meta.app_label, model._meta.model_name))
 
     def build_attrs(self, base_attrs, extra_attrs=None):
         """
@@ -418,6 +417,7 @@ class AutocompleteMixin:
             'data-theme': 'admin-autocomplete',
             'data-allow-clear': json.dumps(not self.is_required),
             'data-placeholder': '',  # Allows clearing of the input.
+            'data-django-to-field': self.to_field,
             'class': attrs['class'] + (' ' if attrs['class'] else '') + 'admin-autocomplete',
         })
         return attrs
@@ -434,9 +434,9 @@ class AutocompleteMixin:
         if not self.is_required and not self.allow_multiple_selected:
             default[1].append(self.create_option(name, '', '', False, 0))
         choices = (
-            (getattr(obj, self.to_field) if self.to_field else obj.pk, self.choices.field.label_from_instance(obj))
+            (getattr(obj, self.to_field), self.choices.field.label_from_instance(obj))
             for obj in self.choices.queryset.using(self.db).filter(**{
-                (self.to_field if self.to_field else 'pk') + '__in': selected_choices})
+                f'{self.to_field}__in': selected_choices})
         )
         for option_value, option_label in choices:
             selected = (
diff --git a/tests/admin_views/test_autocomplete_view.py b/tests/admin_views/test_autocomplete_view.py
index ef75523fb0..89dc8e12bd 100644
--- a/tests/admin_views/test_autocomplete_view.py
+++ b/tests/admin_views/test_autocomplete_view.py
@@ -74,7 +74,7 @@ class AutocompleteJsonViewTests(AdminViewBasicTestCase):
         # test for `to_field`
         fk = ReferencedByParent.objects.create(name='ref by parent')
         p = ParentWithFK.objects.create(fk=fk)
-        request = self.factory.get(self.url_to_field, {'term': 'by', 'to_field': 'name'})
+        request = self.factory.get(self.url_to_field, {'term': 'by', '_to_field': 'name'})
         request.user = self.superuser
         response = AutocompleteJsonView.as_view(**self.as_view_args_to_field)(request)
         self.assertEqual(response.status_code, 200)
diff --git a/tests/admin_widgets/test_autocomplete_widget.py b/tests/admin_widgets/test_autocomplete_widget.py
index 3631320cff..6c9c3da5d7 100644
--- a/tests/admin_widgets/test_autocomplete_widget.py
+++ b/tests/admin_widgets/test_autocomplete_widget.py
@@ -54,7 +54,8 @@ class AutocompleteMixinTests(TestCase):
             'data-ajax--cache': 'true',
             'data-ajax--delay': 250,
             'data-ajax--type': 'GET',
-            'data-ajax--url': '/admin_widgets/band/autocomplete/?to_field=id',
+            'data-ajax--url': '/admin_widgets/band/autocomplete/',
+            'data-django-to-field': 'id',
             'data-theme': 'admin-autocomplete',
             'data-allow-clear': 'false',
             'data-placeholder': ''
@@ -79,13 +80,13 @@ class AutocompleteMixinTests(TestCase):
         rel = Album._meta.get_field('band').remote_field
         w = AutocompleteSelect(rel, admin.site)
         url = w.get_url()
-        self.assertEqual(url, '/admin_widgets/band/autocomplete/?to_field=id')
+        self.assertEqual(url, '/admin_widgets/band/autocomplete/')
 
     def test_get_url_to_field(self):
         rel = Profile._meta.get_field('user').remote_field
         w = AutocompleteSelect(rel, admin.site)
-        url = w.get_url()
-        self.assertEqual(url, '/auth/user/autocomplete/?to_field=username')
+        attrs = w.build_attrs({})
+        self.assertEqual(attrs['data-django-to-field'], 'username')
 
     def test_render_options(self):
         beatles = Band.objects.create(name='The Beatles', style='rock')
-- 
2.23.0