64 lines
No EOL
1.9 KiB
Python
64 lines
No EOL
1.9 KiB
Python
"""Alembic environment configuration for database migrations.
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Configures offline and online migration contexts using SQLAlchemy
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and the target metadata defined in db_async.metadata.
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"""
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import os
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from logging.config import fileConfig
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from sqlalchemy import engine_from_config, pool
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from alembic import context
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# Alembic Config object provides access to values in the .ini file
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config = context.config
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# Override sqlalchemy.url with DATABASE_URL environment variable if provided
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database_url = os.getenv('DATABASE_URL', config.get_main_option('sqlalchemy.url'))
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config.set_main_option('sqlalchemy.url', database_url)
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# Set up Python logging according to config file
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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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# add your model's MetaData object here
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# for 'autogenerate' support
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from db_async import metadata # noqa
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target_metadata = metadata
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def run_migrations_offline():
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"""Run migrations in 'offline' mode using literal SQL script generation."""
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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 run_migrations_online():
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"""Run migrations in 'online' mode against a live database connection."""
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connectable = 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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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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)
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with context.begin_transaction():
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context.run_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() |