tortoise / tortoise/tortoise-orm
A question about filter queries, is it unsupported or a bug?
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Description
tortoise-orm == 0.24.0
tags = fields.ManyToManyField(
'blog.Tags',
related_name='blogs',
description='tag',
through="blog_blog_tags",
forward_key="tags_id",
backward_key="blog_id"
)
I have a simple query requirement that needs to retrieve data with tag ids 469 and 7107 simultaneously, but there is a prerequisite condition: only need to query simultaneously when new is true.
Initially, the code was like this
blog_queryset = Blog.filter(tags__id=469)
if new:
blog_queryset.filter(tags__id=7107)
But I found that the query results are empty,When handling many-to-many relationships, using .filter(tags__id=X).filter(tags__id=Y) consecutively does not produce an intersection query.
Then I tried to query using Q expressions.
query.filter(Q(tags__id=469) & Q(tags__id=7107))
I found that the result is still empty. But strangely, when I changed & to and, I was able to get the correct query results, which were no longer empty.
query.filter(Q(tags__id=469) and Q(tags__id=7107))
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No repository file, test, or entry point is named. Reproduce the ManyToMany setup and compare the chained filters with the two Q-expression forms shown, including generated queries and returned rows. Done means the behavior is confirmed and covered by a focused regression test or clearly identified as supported usage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- backend, database
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100