def run_migrations_online():
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
connectable = sqlalchemy.engine_from_config(
config.get_section(config.config_ini_section),
prefix='sqlalchemy.',
poolclass=sqlalchemy.pool.NullPool,
)
with connectable.connect() as connection:
context.configure(
connection=connection,
target_metadata=target_metadata,
version_table=config.get_main_option('version_table'),
)
with context.begin_transaction():
context.run_migrations()
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