Re: [Django] #36197: Model.relatedmanager.count() always 0 for custom ManyToMany relationships with through model with to_fields (was: `Model.relatedmanager.count()` fails for custom ManyToMany relationships with `through` definition)

[Django]

#36197: Model.relatedmanager.count() always 0 for custom ManyToMany relationships
with through model with to_fields
-------------------------------------+-------------------------------------
Reporter: mfontana-elem | Owner: (none)
Type: Bug | Status: new
Component: Database layer | Version: 5.1
(models, ORM) |
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Sarah Boyce):

* cc: ontowhee, Simon Charette, Mariusz Felisiak (added)
* severity: Normal => Release blocker
* stage: Unreviewed => Accepted
* summary:
`Model.relatedmanager.count()` fails for custom ManyToMany
relationships with `through` definition
=>
Model.relatedmanager.count() always 0 for custom ManyToMany
relationships with through model with to_fields

Comment:

Thank you! Replicated and bisected to
66e47ac69a7e71cf32eee312d05668d8f1ba24bb (#29725)

Possible regression test/asserts
{{{#!diff
--- a/tests/m2m_through/tests.py
+++ b/tests/m2m_through/tests.py
@@ -521,6 +521,8 @@ class M2mThroughToFieldsTests(TestCase):

def test_retrieval(self):
# Forward retrieval
+ self.assertEqual(self.curry.ingredients.exists(), True)
+ self.assertEqual(self.curry.ingredients.count(), 3)
self.assertSequenceEqual(
self.curry.ingredients.all(), [self.pea, self.potato,
self.tomato]
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/36197#comment:2>
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