46 lines
1.8 KiB
Python
46 lines
1.8 KiB
Python
# routers.py
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class ProjectDatabaseRouter:
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"""
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A router to control all database operations on models in the
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simpsons and cloudmanager applications.
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"""
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def db_for_read(self, model, **hints):
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"""Attempts to read simpsons and cloudmanager models go to their specific dbs."""
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if model._meta.app_label == 'simpsons':
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return 'simpsons_db'
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if model._meta.app_label == 'cloudmanager':
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return 'cloudmanager_db'
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return 'default'
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def db_for_write(self, model, **hints):
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"""Attempts to write simpsons and cloudmanager models go to their specific dbs."""
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if model._meta.app_label == 'simpsons':
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return 'simpsons_db'
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if model._meta.app_label == 'cloudmanager':
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return 'cloudmanager_db'
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return 'default'
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def allow_relation(self, obj1, obj2, **hints):
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"""Allow relations if both models are in the same database."""
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# Prevents accidental foreign key relationships across different physical DBs
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if (
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obj1._meta.app_label in ['simpsons', 'cloudmanager'] or
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obj2._meta.app_label in ['simpsons', 'cloudmanager']
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):
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return obj1._meta.app_label == obj2._meta.app_label
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return None
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def allow_migrate(self, db, app_label, model_name=None, **hints):
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"""Ensure the app's models only show up in the designated database."""
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if app_label == 'simpsons':
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return db == 'simpsons_db'
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if app_label == 'cloudmanager':
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return db == 'cloudmanager_db'
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# Ensure default Django apps (auth, sessions, etc.) don't migrate into simpsons/cloudmanager
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if db in ['simpsons_db', 'cloudmanager_db']:
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return False
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return None |