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https://issues.apache.org/jira/browse/AIRFLOW-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16127560#comment-16127560
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Trevor Edwards commented on AIRFLOW-1505:
-----------------------------------------
https://github.com/apache/incubator-airflow/pull/2523
> Document when Jinja substitution occurs
> ---------------------------------------
>
> Key: AIRFLOW-1505
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1505
> Project: Apache Airflow
> Issue Type: Improvement
> Reporter: Trevor Edwards
> Assignee: Trevor Edwards
> Priority: Minor
>
> It is not explicitly mentioned anywhere in the documentation when Jinja
> template substitution occurs. It would be helpful to note this to prevent
> users from being confused when trying to use Jinja substitution in operators.
> The DAG provided in https://issues.apache.org/jira/browse/AIRFLOW-1504 is an
> example of a misunderstanding of this. The DAG attempts to print a field
> before it has been substituted, and if the user does not know when
> substitution happens, they may believe that substitution has failed.
> The documentation should note that substitution occurs just before the
> pre_execute function is called.
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