curo1305
75ea7ef106
- backend/alembic.ini: script_location=migrations, sqlalchemy.url=%(DATABASE_MIGRATE_URL)s
- backend/migrations/env.py: async_engine_from_config + Base.metadata wiring;
runtime os.environ.get("DATABASE_MIGRATE_URL") injection (alembic.ini interpolation
does not read OS env directly)
- backend/migrations/versions/0001_initial_schema.py: creates all 11 tables in
dependency order with correct FKs, indexes, and named constraints
- documents.user_id is nullable=True per D-03; Phase 2 adds NOT NULL
- Ends with GRANT + ALTER DEFAULT PRIVILEGES for docuvault_app (Pitfall 4)
- Also grants USAGE/SELECT on sequences (audit_log.id autoincrement)
- downgrade() drops all tables in reverse dependency order
104 lines
3.0 KiB
Python
104 lines
3.0 KiB
Python
import asyncio
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import os
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from logging.config import fileConfig
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from sqlalchemy import pool
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from sqlalchemy.engine import Connection
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from sqlalchemy.ext.asyncio import async_engine_from_config
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from alembic import context
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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# Inject the runtime DSN from the OS environment.
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# %(DATABASE_MIGRATE_URL)s interpolation in alembic.ini only works when the variable
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# is defined in the [alembic] section — it does NOT read from the OS environment.
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# We override sqlalchemy.url here so that the env var is honoured at runtime.
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config.set_main_option(
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"sqlalchemy.url",
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os.environ.get(
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"DATABASE_MIGRATE_URL",
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config.get_main_option("sqlalchemy.url") or "",
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),
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)
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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# Import all models so that Base.metadata is populated for autogenerate support.
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# This MUST happen before target_metadata is assigned — Alembic won't see tables
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# that haven't been imported (RESEARCH.md Pitfall 2).
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from db.models import Base # noqa: F401 — must import to register all models (Pitfall 2)
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target_metadata = Base.metadata
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# other values from the config, defined by the needs of env.py,
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# can be acquired:
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# my_important_option = config.get_main_option("my_important_option")
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# ... etc.
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def run_migrations_offline() -> None:
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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)
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with context.begin_transaction():
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context.run_migrations()
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def do_run_migrations(connection: Connection) -> None:
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context.configure(connection=connection, target_metadata=target_metadata)
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with context.begin_transaction():
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context.run_migrations()
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async def run_async_migrations() -> None:
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"""In this scenario we need to create an Engine
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and associate a connection with the context.
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"""
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connectable = async_engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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async with connectable.connect() as connection:
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await connection.run_sync(do_run_migrations)
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await connectable.dispose()
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def run_migrations_online() -> None:
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"""Run migrations in 'online' mode."""
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asyncio.run(run_async_migrations())
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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