Comments (6)
@pwfff With.join()
has been reimplemented to use real joins now, and there is a secret parameter that you can pass to specify a LEFT OUTER JOIN. Example usage:
from django.db.models.sql.constants import LOUTER
query = cte.join(Region, name=cte.col.name, _join_type=LOUTER)
approximate SQL:
SELECT ...
FROM region
LEFT OUTER JOIN cte ON region.name = cte.name
Fair warning: this is an undocumented feature, and may change in the future. Also be careful: the join may be automatically changed to an INNER JOIN if you subsequently (after calling cte.join(...)
) do other things like add filters involving joins to the queryset.
If you're satisfied with this I think we can close #1. Let me know what you think.
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It works as well as the version I had, but I'm still running into this issue:
django.db.utils.ProgrammingError: invalid reference to FROM-clause entry for table "share"
LINE 1: ...LEFT OUTER JOIN "my_table" V8 ON V0."foo_id" = ("my_table"."j...
^
HINT: Perhaps you meant to reference the table alias "v8".
I'll see if I can get a simple reproduction for you.
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Seems to happen when doing something like Foo.objects.filter(id__in=my_joined_queryset_with_ctes)
. Everything in the subquery gets an extra alias, but it doesn't resolve.
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I have an attempt at a fix in #4.
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@pwfff Is this issue resolved now?
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Yes, with #4. Thank you!
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Related Issues (20)
- Improve documentation HOT 3
- is there a way to select from a cte without joining it with a model? HOT 5
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- hnej
- `.update()` does not work when accessing nested tables HOT 1
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- How to use as default manager? HOT 1
- Prefetch objects with their nested children
- issue while trying to use with_cte on EmptyResultSet HOT 1
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