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from typing import Iterable
from django.apps import apps
from django.conf import settings
from django_pgschemas.schema import get_current_schema
from django_pgschemas.utils import get_tenant_database_alias
class TenantAppsRouter:
"""
A router to control which applications will be actually migrated depending on the schema.
"""
def app_in_list(self, app_label: str, app_list: Iterable) -> bool:
app_config = apps.get_app_config(app_label)
app_config_full_name = f"{app_config.__module__}.{app_config.__class__.__name__}"
return (app_config.name in app_list) or (app_config_full_name in app_list)
def allow_migrate(
self, db: str, app_label: str, model_name: str | None = None, **hints: object
) -> bool | None:
current_schema = get_current_schema()
if db != get_tenant_database_alias() or current_schema is None:
return False
app_list = []
if current_schema.schema_name == "public":
app_list = settings.TENANTS["public"]["APPS"]
elif current_schema.schema_name in settings.TENANTS:
app_list = settings.TENANTS[current_schema.schema_name]["APPS"]
else:
app_list = settings.TENANTS["default"]["APPS"]
if not app_list:
return None
return self.app_in_list(app_label, app_list)
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