[1.8.x] Reverted "Fixed #27594 -- Fixed select_related() with reverse self-referential OneToOneField."

This reverts commit 4a9f9cc521. It was
accidentally pushed to this branch.

django/db/models/sql/compiler.py

@@ -724,7 +724,7 @@ class SQLCompiler(object):
 
                 _, _, _, joins, _ = self.query.setup_joins([related_field_name], opts, root_alias)
                 alias = joins[-1]
-                from_parent = issubclass(model, opts.model) and model is not opts.model
+                from_parent = issubclass(model, opts.model)
                 klass_info = {
                     'model': model,
                     'field': f,

tests/select_related_onetoone/models.py

@@ -102,12 +102,3 @@ class Child3(Child2):
 
 class Child4(Child1):
     value4 = models.IntegerField()
-
-
-class LinkedList(models.Model):
-    name = models.CharField(max_length=50)
-    previous_item = models.OneToOneField(
-        'self', models.CASCADE,
-        related_name="next_item", blank=True,
-        null=True,
-    )

tests/select_related_onetoone/tests.py

@@ -6,9 +6,8 @@ from django.core.exceptions import FieldError
 from django.test import TestCase
 
 from .models import (
-    AdvancedUserStat, Child1, Child2, Child3, Child4, Image, LinkedList,
-    Parent1, Parent2, Product, StatDetails, User, UserProfile, UserStat,
-    UserStatResult,
+    AdvancedUserStat, Child1, Child2, Child3, Child4, Image, Parent1, Parent2,
+    Product, StatDetails, User, UserProfile, UserStat, UserStatResult,
 )
 
 
@@ -213,13 +212,6 @@ class ReverseSelectRelatedTestCase(TestCase):
         with self.assertNumQueries(1):
             self.assertEqual(p.child1.child4.name1, 'n1')
 
-    def test_self_relation(self):
-        item1 = LinkedList.objects.create(name='item1')
-        LinkedList.objects.create(name='item2', previous_item=item1)
-        with self.assertNumQueries(1):
-            item1_db = LinkedList.objects.select_related('next_item').get(name='item1')
-            self.assertEqual(item1_db.next_item.name, 'item2')
-
 
 class ReverseSelectRelatedValidationTests(TestCase):
     """