Opened 7 years ago
Last modified 7 years ago
#29021 closed Bug
Weird behavior of foreign key lookup and annotate F expression — at Initial Version
Reported by: | Paul | Owned by: | nobody |
---|---|---|---|
Component: | Database layer (models, ORM) | Version: | 1.10 |
Severity: | Normal | Keywords: | django-model, foreign-key |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
class Sentence(Model): name = CharField() class Tokens(Model): token = CharField() sentence = ForeignKey(Sentence, related_name='tokens')
Sentence.objects.annotate(n=Count('tokens', distinct=True)).filter(n=5).filter(tokens__name__in=['se']).annotate(n0=F('tokens')).filter(tokens__name__in=['faire']).annotate(n1=F('tokens')).filter(tokens__name__in=['faire']).annotate(n2=F('tokens')).filter(tokens__name__in=['un']).annotate(n3=F('tokens')).filter(tokens__name__in=['avoir']).annotate(n4=F('tokens'))
Above code generates the following query:
SELECT "sentence"."id", "sentence"."name" COUNT(DISTINCT "token"."id") AS "n", T3."id" AS "n0", T4."id" AS "n1", T4."id" AS "n2", T6."id" AS "n3", T6."id" AS "n4" FROM "sentence" LEFT OUTER JOIN "token" ON ("sentence"."id" = "token"."sentence_id") INNER JOIN "token" T3 ON ("sentence"."id" = T3."sentence_id") INNER JOIN "token" T4 ON ("sentence"."id" = T4."sentence_id") INNER JOIN "token" T5 ON ("sentence"."id" = T5."sentence_id") INNER JOIN "token" T6 ON ("sentence"."id" = T6."sentence_id") INNER JOIN "token" T7 ON ("sentence"."id" = T7."sentence_id") WHERE (T3."name" IN (se) AND T4."name" IN (faire) AND T5."name" IN (un) AND T6."name" IN (avoir) AND T7."name" IN (faire)) GROUP BY "word_frword"."id", T3."id", T4."id", T6."id" HAVING COUNT(DISTINCT "token"."id") = 5
Why is numbering so strange (starts with T3
)? But moreover why n2
is assigned to T4
, not T5
? Same for n4
and T6
. Looks like numbers go by 2.
What I want to accomplish is capture token id on each step of inner join. It works when there are one join, but then it breaks.
Any suggestions?
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