add multi tenant alembic

backend/alembic/env.py

@@ -9,9 +9,9 @@
 from sqlalchemy.ext.asyncio import create_async_engine
 from celery.backends.database.session import ResultModelBase  # type: ignore
 from sqlalchemy.schema import SchemaItem
+from sqlalchemy.sql import text
 
-# this is the Alembic Config object, which provides
-# access to the values within the .ini file in use.
+# Alembic Config object
 config = context.config
 
 # Interpret the config file for Python logging.
@@ -21,16 +21,26 @@
 ):
     fileConfig(config.config_file_name)
 
-# add your model's MetaData object here
+# Add your model's MetaData object here
 # for 'autogenerate' support
 # from myapp import mymodel
 # target_metadata = mymodel.Base.metadata
 target_metadata = [Base.metadata, ResultModelBase.metadata]
 
-# other values from the config, defined by the needs of env.py,
-# can be acquired:
-# my_important_option = config.get_main_option("my_important_option")
-# ... etc.
+
+def get_schema_options() -> tuple[str, bool]:
+    x_args_raw = context.get_x_argument()
+    x_args = {}
+    for arg in x_args_raw:
+        for pair in arg.split(","):
+            if "=" in pair:
+                key, value = pair.split("=", 1)
+                x_args[key] = value
+
+    schema_name = x_args.get("schema", "public")
+    create_schema = x_args.get("create_schema", "true").lower() == "true"
+    return schema_name, create_schema
+
 
 EXCLUDE_TABLES = {"kombu_queue", "kombu_message"}
 
@@ -54,40 +64,49 @@ def run_migrations_offline() -> None:
     and not an Engine, though an Engine is acceptable
     here as well.  By skipping the Engine creation
     we don't even need a DBAPI to be available.
-
     Calls to context.execute() here emit the given string to the
     script output.
-
     """
     url = build_connection_string()
+    schema, _ = get_schema_options()
+
     context.configure(
         url=url,
         target_metadata=target_metadata,  # type: ignore
         literal_binds=True,
+        include_object=include_object,
         dialect_opts={"paramstyle": "named"},
+        version_table_schema=schema,
+        include_schemas=True,
     )
 
     with context.begin_transaction():
         context.run_migrations()
 
 
 def do_run_migrations(connection: Connection) -> None:
+    schema, create_schema = get_schema_options()
+    if create_schema:
+        connection.execute(text(f'CREATE SCHEMA IF NOT EXISTS "{schema}"'))
+        connection.execute(text("COMMIT"))
+
+    connection.execute(text(f'SET search_path TO "{schema}"'))
+
     context.configure(
         connection=connection,
         target_metadata=target_metadata,  # type: ignore
-        include_object=include_object,
-    )  # type: ignore
+        version_table_schema=schema,
+        include_schemas=True,
+        compare_type=True,
+        compare_server_default=True,
+    )
 
     with context.begin_transaction():
         context.run_migrations()
 
 
 async def run_async_migrations() -> None:
-    """In this scenario we need to create an Engine
-    and associate a connection with the context.
-
-    """
-
+    """Run migrations in 'online' mode."""
     connectable = create_async_engine(
         build_connection_string(),
         poolclass=pool.NullPool,
@@ -101,7 +120,6 @@ async def run_async_migrations() -> None:
 
 def run_migrations_online() -> None:
     """Run migrations in 'online' mode."""
-
     asyncio.run(run_async_migrations())