renaming to core

django_code/core/routers.py

@@ -0,0 +1,46 @@
+# routers.py
+
+class ProjectDatabaseRouter:
+    """
+    A router to control all database operations on models in the
+    simpsons and cloudmanager applications.
+    """
+
+    def db_for_read(self, model, **hints):
+        """Attempts to read simpsons and cloudmanager models go to their specific dbs."""
+        if model._meta.app_label == 'simpsons':
+            return 'simpsons_db'
+        if model._meta.app_label == 'cloudmanager':
+            return 'cloudmanager_db'
+        return 'default'
+
+    def db_for_write(self, model, **hints):
+        """Attempts to write simpsons and cloudmanager models go to their specific dbs."""
+        if model._meta.app_label == 'simpsons':
+            return 'simpsons_db'
+        if model._meta.app_label == 'cloudmanager':
+            return 'cloudmanager_db'
+        return 'default'
+
+    def allow_relation(self, obj1, obj2, **hints):
+        """Allow relations if both models are in the same database."""
+        # Prevents accidental foreign key relationships across different physical DBs
+        if (
+                obj1._meta.app_label in ['simpsons', 'cloudmanager'] or
+                obj2._meta.app_label in ['simpsons', 'cloudmanager']
+        ):
+            return obj1._meta.app_label == obj2._meta.app_label
+        return None
+
+    def allow_migrate(self, db, app_label, model_name=None, **hints):
+        """Ensure the app's models only show up in the designated database."""
+        if app_label == 'simpsons':
+            return db == 'simpsons_db'
+        if app_label == 'cloudmanager':
+            return db == 'cloudmanager_db'
+
+        # Ensure default Django apps (auth, sessions, etc.) don't migrate into simpsons/cloudmanager
+        if db in ['simpsons_db', 'cloudmanager_db']:
+            return False
+
+        return None