database/migration/env.py
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 = db_manager.get_session('default').get_bind()

    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            compare_type=True,
        )

        with context.begin_transaction():
            context.run_migrations()
Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    
Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
Run migrations in ' online ' mode . In this scenario we need to create an Engine and associate a connection with the context .
def run_migrations_online():
    connectable = db_manager.get_session('default').get_bind()
    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            compare_type=True,
        )
        with context.begin_transaction():
            context.run_migrations()
def run_migrations_online ( ) : connectable = db_manager . get_session ( 'default' ) . get_bind ( ) with connectable . connect ( ) as connection : context . configure ( connection = connection , target_metadata = target_metadata , compare_type = True , ) with context . begin_transaction ( ) : context . run_migrations ( )
Run migrations in 'online' mode.
Run migrations in ' online ' mode .
"""Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """