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self-referential subqueries on MySQL.
Backport of 4074f38e1dcc93b859bbbfd6abd8441c3bca36b3 from main
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distinct().
Backport of 6307c3f1a123f5975c73b231e8ac4f115fd72c0d from master
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Ticket19102Tests.test_ticket_19102_distinct_on.
The subquery pushdown only happens because another table is involved in
filter. It's not the distinct usage that causes the pushdown.
The distinct('description').order_by('pk') expression is not valid
because SELECT DISTINCT ON must match initial ORDER BY expressions
which is not the case here.
Backport of 4e8ecf0cb6ea36c45edb9cb86f0d63224e08097e from master
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instance deletion.
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This new technique is more straightforward and compatible with test
parallelization, where the effective database connection settings no
longer match settings.DATABASES.
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ForeignKey/OneToOneField
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Rewrote the test for #9479 according to the original ticket.
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It contained models, forms and admin objects causing undesirable
import side effects. Refs #16368.
Thanks to Ramiro, Carl and Loïc for the review.
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Signed-off-by: Jason Myers <jason@jasonamyers.com>
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Should be unneeded with Python 2.7 and up.
Added some unicode_literals along the way.
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Fixed #20483.
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enter_transaction_management() was nearly always followed by managed().
In three places it wasn't, but they will all be refactored eventually.
The "forced" keyword argument avoids introducing behavior changes until
then.
This is mostly backwards-compatible, except, of course, for managed
itself. There's a minor difference in _enter_transaction_management:
the top self.transaction_state now contains the new 'managed' state
rather than the previous one. Django doesn't access
self.transaction_state in _enter_transaction_management.
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There were a couple of errors in ._dirty flag handling:
* It started as None, but was never reset to None.
* The _dirty flag was sometimes used to indicate if the connection
was inside transaction management, but this was not done
consistently. This also meant the flag had three separate values.
* The None value had a special meaning, causing for example inability
to commit() on new connection unless enter/leave tx management was
done.
* The _dirty was tracking "connection in transaction" state, but only
in managed transactions.
* Some tests never reset the transaction state of the used connection.
* And some additional less important changes.
This commit has some potential for regressions, but as the above list
shows, the current situation isn't perfect either.
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