#32403: When run test with off postgres database got `RuntimeError: generator
didn't yield` instead of connection error
----------------------------------+--------------------------------------
Reporter: Kazantcev Andrey | Owner: (none)
Type: Bug | Status: closed
Component: contrib.postgres | Version: 3.2
Severity: Normal | Resolution: needsinfo
Keywords: postgres db | Triage Stage: Unreviewed
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 Kazantcev Andrey):
Replying to [comment:1 Mariusz Felisiak]:
> Thanks for the report, however the builtin
`django.db.backends.postgresql` backend (on Python `3.9.0+` and `3.8.5`)
raises `Connection refused` for me (as expected):
> {{{
> django.db.utils.OperationalError: could not connect to server:
Connection refused
> Is the server running on host "localhost" (127.0.0.1) and
accepting
> TCP/IP connections on port 5432?
> }}}
>
> Can you share more details or a database configuration?
Configuration
```
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.getenv('POSTGRESQL_NAME', 'postgres'),
'USER': os.getenv('POSTGRESQL_USER', 'postgres'),
'PASSWORD': os.getenv('POSTGRESQL_PASSWORD', 'postgres'),
'HOST': os.getenv('POSTGRESQL_HOST', 'localhost'),
'PORT': os.getenv('POSTGRESQL_PORT', '5432'),
'OPTIONS': json.loads(os.getenv('POSTGRESQL_ENGINE_OPTIONS',
'{}'))
}
}
```
I found a problem. The problem is in [these
lines](https://github.com/django/django/blob/f9cfd346f0222d86bfbac26ef5455806965bae6b/django/db/backends/postgresql/base.py#L324-L325).
If I have one connection and test expression in if return false then
function just return without reraise exception. And `contextmanager`
raises error `RuntimeError: generator didn't yield`
--
Ticket URL: <https://code.djangoproject.com/ticket/32403#comment:2>
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