#31963: Django: Nested OuterRef not woking to access grandparent's ID
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
ashish141199 |
Type: Bug | Status: new
Component: Database | Version: 2.2
layer (models, ORM) | Keywords: OuterRef, QuerySet,
Severity: Normal | Django Filter, Annotation,
Triage Stage: | Database, ORM
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Trying to access FeeAccount model's id using **OuterRef** in a **nested
subquery**, but **not immediate parent**. Throwing:
`ValueError: This queryset contains a reference to an outer query and may
only be used in a subquery.`
```
first_unpaid_fee_schedule_instalment =
Subquery(FeeScheduleInstalment.objects \
.annotate(
total_balance = Subquery(
FeeInstalmentTransaction.objects.filter(
account_id=OuterRef(OuterRef('id')), # not
working: need grand-parent's id here
instalment__schedule=OuterRef('id'),
#working: parent's id
) \
.values('balance') \
.annotate(total_balance=Sum('balance')) \
.values('total_balance')
)
) \
.values('id')[:1]
)
fee_accounts_with_first_unpaid = FeeAccount.objects \
.annotate(
first_unpaid_schedule =
first_unpaid_fee_schedule_instalment,
)
```
--
Ticket URL: <https://code.djangoproject.com/ticket/31963>
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