[jira] [Commented] (AIRFLOW-54) Special tags when referring to other tasks

["Chris Riccomini (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-54?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15274203#comment-15274203 ] 

Chris Riccomini commented on AIRFLOW-54:
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+1 this seems really useful

> Special tags when referring to other tasks
> ------------------------------------------
>
>                 Key: AIRFLOW-54
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-54
>             Project: Apache Airflow
>          Issue Type: New Feature
>          Components: hooks, operators
>            Reporter: Adam Mustafa
>            Priority: Minor
>
> At the moment when you need to refer to other tasks, you either have to refer to them by name or search though a list of upstream objects. 
> For example, in order to get the task_ids needed by xcom_pull for the upstream items, you need to do:
>     
>      ti.xcom_pull(task_ids=[task.task_id for task in self.upstream_list])[0]
> This issue suggests adding a keyword operator similar in form to those the schedule would use. 
> Possible items might include:
> @upstream: Tasks directly upstream
> @ancestor: Any task that is in the ancestor tree of this dag
> @sibling: other tasks stemming from the same upstream tasks
> @children: tasks from the children of this node
> Aside from providing more simple arguments, this also improves the readability of the functions.



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