macOS/SQLite test failure

[Johannes Maron]

This bug was discovered during GitHub action trails, while running the test suite agianst macOS, see also: ​https://github.com/codingjoe/django/runs/292481675

FAIL: test_db_table (schema.tests.SchemaTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/runner/runners/2.160.0/work/django/django/django/test/utils.py", line 370, in inner
    return func(*args, **kwargs)
  File "/Users/runner/runners/2.160.0/work/django/django/tests/schema/tests.py", line 2249, in test_db_table
    self.assertForeignKeyExists(Book, "author_id", "schema_otherauthor")
  File "/Users/runner/runners/2.160.0/work/django/django/tests/schema/tests.py", line 207, in assertForeignKeyExists
    self.assertEqual(constraint_fk, (expected_fk_table, field))
AssertionError: Tuples differ: ('schema_author', 'id') != ('schema_otherauthor', 'id')

First differing element 0:
'schema_author'
'schema_otherauthor'

- ('schema_author', 'id')
+ ('schema_otherauthor', 'id')
?          +++++


----------------------------------------------------------------------
Ran 13209 tests in 487.293s

[Simon Charette]

Pretty sure this is related to the SQLite version installed.

What does python -c"import sqlite3; print(sqlite3.version_info, sqlite3.sqlite_version)" yield?

[Simon Charette]

Probably want to brew install sqlite as well at ​https://github.com/codingjoe/django/blob/f67edd20b80de813d55f5df79c0d0c6134e8b754/.github/workflows/ci.yml#L52

[Carlton Gibson]

This passed for me with SQLite 3.24, so I'm going to close assuming that the SQLite version is the underlying cause.

It's probably invalid but I'll give it a needsinfo since 7444f3252757ed4384623e5afd7dcfeef3e0c74e added a check_sqlite_version()
which raises if Database.sqlite_version_info < (3, 8, 3) — so the version in play must be higher that that — maybe there's room for a cleanup here, if you can follow-up Joe 🤔
(No worries if not.)

[Johannes Maron]

Hold your horses, it's version 3.28.0 which should be supported, right?

Run python -c "import sqlite3; print(sqlite3.sqlite_version)"
3.28.0

[Simon Charette]

It should indeed be supported but I can't reproduce on macOS Mojave with 3.28.0.

Did brew install sqlite help anyhow?

[Johannes Maron]

@Simon

$ brew update
$ brew install sqlite
Warning: sqlite 3.30.1 is already installed and up-to-date
To reinstall 3.30.1, run `brew reinstall sqlite`

Interestingly enough sqlite3.sqlite_version is still 3.28.0.
In am not 100% sure this is a sqlite issue. This could also be something OS related. Which would make sense considering that it apears to happen only on macOS.

[Carlton Gibson]

Hey Joe:

Interestingly enough sqlite3.sqlite_version is still 3.28.0.

You have to tell Python where to find your SQLite. The internet suggests LD_LIBRARY_PATH, but on macOS I find you have to set DYLD_LIBRARY_PATH:

    export DYLD_LIBRARY_PATH=/opt/homebrew/Cellar/sqlite/3.28.1/lib

Simon has a variation on those instructions here: ​https://github.com/orf/django-docker-box/issues/25

(I haven't had the bandwidth to try to reproduce this this week, but will have another go after the weekend. If I can't reproduce I will close as needsinfo.)

[Carlton Gibson]

OK, I can't reproduce the issue here. I'll keep an eye on it but, short of more concrete steps, or someone else confirming, I'm not sure what we can do.

[Deep Sukhwani]

Thanks Carlton,

I was able to resolve this failure by:

• installing SQLite 3.31.1 using brew install sqlite
• Setting export DYLD_LIBRARY_PATH=/usr/local/Cellar/sqlite/3.31.1/lib in the shell startup file (~/.bashrc in my case)

Resolved as invalid

Quick question - Should we add this in the Troubleshooting section of Contributing guidelines - ​https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#troubleshooting?