#30111: AppRegistryNotReady-Error when having contrib.postgres in INSTALLED_APPS
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Reporter: Jann Haber | Owner: (none)
Type: Bug | Status: new
Component: contrib.postgres | Version: 2.2
Severity: Normal | Resolution:
Keywords: | 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 Nasir Hussain):
Replying to [ticket:30111 Jann Haber]:
Hi Jann,
So I looked into the code and found the issue.
When contrib.postgres is in INSTALLED_APPS it triggers from
**django.db.migrations.writer import MigrationWriter** import in
[https://github.com/django/django/blob/7185ea6902532eb195d0575d1bf1492ca9d45dea/django/contrib/postgres/apps.py#L8
django/django/contrib/postgres/apps.py] which further triggered
**app_config = apps.get_containing_app_config(module)** import in
[https://github.com/django/django/blob/7185ea6902532eb195d0575d1bf1492ca9d45dea/django/db/models/base.py#L99
ModelBase] Meta class.
ModelBase checks for self.check_apps_ready() while apps have not been
completely loaded yet. So an exception is raised **raise
AppRegistryNotReady("Apps aren't loaded yet.")**
I've changed **django/django/contrib/postgres/apps.py** to import
MigrationWriter only when needed to avoid **check for apps ready** cycle
to fix the issue
[https://github.com/django/django/pull/10861 PR]
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Ticket URL: <https://code.djangoproject.com/ticket/30111#comment:2>
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