104 lines
2.8 KiB
Python
104 lines
2.8 KiB
Python
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import asyncio
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from logging.config import fileConfig
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import sqlalchemy as sa
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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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from unwind import db, models
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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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# 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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def is_different_type(
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context,
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inspected_column: sa.Column,
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metadata_column: sa.Column,
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inspected_type: sa.types.TypeEngine,
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metadata_type: sa.types.TypeEngine,
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) -> bool | None:
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# We used "TEXT" in our manual SQL, which in SQLite is the same as VARCHAR, but
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# for SQLAlchemy/Alembic looks different.
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equiv_types = [(sa.TEXT, sa.String)]
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for types in equiv_types:
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if isinstance(inspected_type, types) and isinstance(metadata_type, types):
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return False
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return None # defer to default compare implementation
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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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context.configure(
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url=db._connection_uri(),
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target_metadata=models.metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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compare_type=is_different_type,
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render_as_batch=True,
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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(
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connection=connection,
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target_metadata=models.metadata,
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compare_type=is_different_type,
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render_as_batch=True,
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)
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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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url=db._connection_uri(),
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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_async() -> 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_async()
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