#33586: Cannot delete object (A) referenced by another object (B) if said object
(A) has a foreign key to a custom user.
-------------------------------+------------------------------------
Reporter: Jeremy Poulin | Owner: Bhuvnesh
Type: Bug | Status: assigned
Component: Migrations | Version: 4.0
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Bhuvnesh):
These lines were loading {{{apps}}} when the migration is applied
backward. So instead of popping, simply not loading them inside
{{{MigrationExecutor._migrate_all_backwards}}} should do the work.
{{{#!diff
diff --git a/django/db/migrations/executor.py
b/django/db/migrations/executor.py
index eb738cf457..988fb48cd9 100644
--- a/django/db/migrations/executor.py
+++ b/django/db/migrations/executor.py
@@ -200,8 +200,6 @@ class MigrationExecutor:
# process.
break
if migration in migrations_to_run:
- if "apps" not in state.__dict__:
- state.apps # Render all -- performance critical
# The state before this migration
states[migration] = state
# The old state keeps as-is, we continue with the new
state
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/33586#comment:12>
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