Make custom Airflow macros expand other macros

Question

Is there any way to make a user-defined macro in Airflow which is itself computed from other macros?

from airflow impo         


        

Answer 1

user_defined_macros are not processed as templates by default. If you want to keep a template in a user_defined_macro (or if you use a template in a params variable), you can always re-run the templating function manually:

class DoubleTemplatedBashOperator(BashOperator):
    def pre_execute(self, context):
        context['ti'].render_templates()

And this will work for templates that don't also reference other parameters or UDMs. This way, you can have "two-deep" templates.

Or put your UDM directly in the BashOperator's command instead (the easiest solution):

BashOperator(
    task_id='bash_op',
    bash_command='echo "{{ dag.following_schedule(execution_date) }}"',
    dag=dag,
)