#29545: Nested OuterRef not looking on the right model for the field.
-------------------------------------+-------------------------------------
     Reporter:  Aaron Lisman         |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  2.0
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  outerref, subquery   |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by Can Sarıgöl):

 * cc: Can Sarıgöl (added)


Comment:

 IMO this query join order should be like this:

 {{{
 inner = Item.objects.filter(

 middle = Invoice.objects.filter(

 outer = Item.objects.filter(
 }}}

 If you want to use nested outerref, middle query has to contain foreign
 keys. Otherwise, this usage needs to include deep related field.


 {{{
 middle = Item.objects.filter(invoices=OuterRef('id'),).annotate(
             expensed=Exists(inner),
             owner=F('invoices__owner')
         ).filter(expensed=False,)
 }}}

 or maybe not necessary nested outerref

 {{{
 inner = Invoice.objects.filter(
             kind=Invoice.EXPENSE,
             owner=OuterRef('invoices__owner'),
             items=OuterRef('id'),
         )
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29545#comment:3>
Django <https://code.djangoproject.com/>
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