#36652: Loading squashed migrations from disk raises CircularDependencyError
indeterministically
--------------------------------+------------------------------------------
Reporter: Jayden Kneller | Owner: Augusto Pontes
Type: Bug | Status: assigned
Component: Migrations | Version: dev
Severity: Normal | Resolution:
Keywords: squashed | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by 허진수):
If i've understood correctly, the order can be fixed with PYTHONHASHSEED
env variable. Because Python iterates over set using the location of each
items, and it is based on the hash value. Python also uses seed to
randomize the hash results.
So, it's possible to test using `PYTHONHASHSEED` and `subprocess`. So we
just need to find the value that causes CircularDependencyError.
Here is simple example.
{{{
class SomeTestClass(TestCase):
def test():
...
#####
# other file
#####
def some_test_method():
env_vars = os.environ.copy()
env_vars['PYTHONHASHSEED'] = '0'
result = subprocess.run(
[sys.executable, '-m', 'unittest', 'test_file.py'],
env=env_vars,
capture_output=True,
text=True
)
}}}
I'm not sure if the result will be same, given a fixed `PYTHONHASHSEED`
env variable.
If something wrong here, please tell me.
Actually It's my first time on open source:)
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Ticket URL: <https://code.djangoproject.com/ticket/36652#comment:27>
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