[Feature request] Move `process_revision_directives` to `alembic_ctx_kwargs` about flask-migrate HOT 2 CLOSED

configure_args = current_app.extensions['migrate'].configure_args
if configure_args.get("process_revision_directives") is None:
    configure_args["process_revision_directives"] = process_revision_directives

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.
I think of another simpler way:
    """python
    # this callback is used to prevent an auto-migration from being generated
    # when there are no changes to the schema
    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
    def process_revision_directives(context, revision, directives):
        if getattr(config.cmd_opts, 'autogenerate', False):
            script = directives[0]
            if script.upgrade_ops.is_empty():
                directives[:] = []
                logger.info('No changes in schema detected.')

    connectable = get_engine()

    configure_args = current_app.extensions['migrate'].configure_args
    if configure_args.get("process_revision_directives") is None:
        configure_args["process_revision_directives"] = process_revision_directives

    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=get_metadata(),
            **configure_args 
        )

        with context.begin_transaction():
            context.run_migrations()