[Django] #29214: SQL-error when updating after annotating using subquery

[Django]

#29214: SQL-error when updating after annotating using subquery
-------------------------------------+-------------------------------------
               Reporter:  Oskar      |          Owner:  nobody
  Persson                            |
                   Type:  Bug        |         Status:  new
              Component:  Database   |        Version:  1.11
  layer (models, ORM)                |       Keywords:  queryset
               Severity:  Normal     |  annotations
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 An SQL-error is raised when updating a queryset which includes an
 annotation created using a subquery, which in turn also uses an
 annotation.


 {{{

 class Recursive(models.Model):
     name = models.CharField(max_length=10)
     link = models.IntegerField()
     parent = models.ForeignKey('self', models.CASCADE, null=True)

 rec1 = Recursive.objects.create(name="r1", link=1)
 rec2 = Recursive.objects.create(name="r2", link=1)
 rec3 = Recursive.objects.create(name="r11", parent=rec1, link=2)

 latest_parent =
 Recursive.objects.filter(link=OuterRef('parent_link')).order_by('id')

 Recursive.objects.filter(parent__isnull=False) \
         .annotate(parent_link=F('parent__link')) \
         .annotate(p=Subquery(latest_parent.values('pk')[:1])) \
         .update(parent_id=F('p'))
 }}}

 {{{
 Traceback (most recent call last):
   File "tests.py", line 88, in
 test_update_annotated_using_related_queryset
     .update(parent_id=F('p'))
   File "/git/django/django/db/models/query.py", line 647, in update
     rows = query.get_compiler(self.db).execute_sql(CURSOR)
   File "/git/django/django/db/models/sql/compiler.py", line 1204, in
 execute_sql
     cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
   File "/git/django/django/db/models/sql/compiler.py", line 899, in
 execute_sql
     raise original_exception
 OperationalError: no such column: T2.link
 }}}

 I've tried this in SQLite and MySQL in Django 1.11.11 and Django 2.0 using
 Python 3.6.0. All raising similar errors.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29214>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.

-- 
You received this message because you are subscribed to the Google Groups 
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to django-updates+unsubscr...@googlegroups.com.
To post to this group, send email to django-updates@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/django-updates/055.f473a6f0158d19b4cb0ad68322705a30%40djangoproject.com.
For more options, visit https://groups.google.com/d/optout.