#33808: Count manytomany__in produces wrong SQL
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
OrsoBruno96 |
Type: Bug | Status: new
Component: Database | Version: 3.2
layer (models, ORM) | Keywords: database, count,
Severity: Normal | query, orm
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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You can find in attachment a minimal working example. I created the zip
with
{{{
django-admin startproject mwe
./manage.py startapp testapp
}}}
Then I only edited the file `testapp/models.py` `testapp/tests.py` and
`mwe/settings.py` (to add the app to the installed apps) and ran
`./manage.py makemigrations testapp`.
Running the tests with the usual `./manage.py test` triggers the problem.
I printed the query produced by django, simply adding a `print` in
`django/db/backends/sqlite/base.py`. The query is the following:
{{{
SELECT DISTINCT "testapp_firstmodel"."id",
COUNT("testapp_secondmodel_related_field2"."secondmodel_id" IN
"testapp_secondmodel_related_field1"."secondmodel_id") AS "howmany"
FROM "testapp_firstmodel"
LEFT OUTER JOIN "testapp_secondmodel_related_field1" ON
("testapp_firstmodel"."id" =
"testapp_secondmodel_related_field1"."firstmodel_id")
LEFT OUTER JOIN "testapp_secondmodel_related_field2" ON
("testapp_firstmodel"."id" =
"testapp_secondmodel_related_field2"."firstmodel_id")
GROUP BY "testapp_firstmodel"."id" LIMIT 21
}}}
Adding a layer of parenthesis in the query inside the `Count` fixes the
issue.
{{{
SELECT DISTINCT "testapp_firstmodel"."id",
COUNT("testapp_secondmodel_related_field2"."secondmodel_id" IN
("testapp_secondmodel_related_field1"."secondmodel_id")) AS "howmany"
FROM "testapp_firstmodel"
LEFT OUTER JOIN "testapp_secondmodel_related_field1" ON
("testapp_firstmodel"."id" =
"testapp_secondmodel_related_field1"."firstmodel_id")
LEFT OUTER JOIN "testapp_secondmodel_related_field2" ON
("testapp_firstmodel"."id" =
"testapp_secondmodel_related_field2"."firstmodel_id")
GROUP BY "testapp_firstmodel"."id" LIMIT 21
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/33808>
Django <https://code.djangoproject.com/>
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