[jira] [Commented] (AIRFLOW-1950) Make xcom_pull's task_ids parameter optional

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332648#comment-16332648 ] 

ASF subversion and git services commented on AIRFLOW-1950:
----------------------------------------------------------

Commit e7c118da2229f508d1f7c9423488aa5df96a2081 in incubator-airflow's branch refs/heads/master from [~bcb]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-airflow.git;h=e7c118d ]

[AIRFLOW-1950] Optionally pass xcom_pull task_ids

Changes the `task_ids` parameter of xcom_pull from
required to optional.

This parameter has always allowed None to be
passed, but since it's a
required parameter, it must be specified as such.

With this change, we're no longer forced to pass
it.

Closes #2902 from bcb/make-xcom-pull-task-ids-
optional


> Make xcom_pull's task_ids parameter optional
> --------------------------------------------
>
>                 Key: AIRFLOW-1950
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1950
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: models
>    Affects Versions: Airflow 1.8, Airflow 1.7.0
>            Reporter: Beau Barker
>            Assignee: Beau Barker
>            Priority: Minor
>              Labels: usability
>             Fix For: 1.10.0
>
>
> The xcom_pull methods require a {{task_ids}} parameter to specify which task pushed the value.
> However you can pass None to bypass this filter, which says "give me the process_id value, regardless of which task pushed it".
> {{ti.xcom_pull(task_ids=None, key='process_id')}}
> Since task_ids is optional, we should make it an optional parameter.
> {{ti.xcom_pull(key='process_id')}}



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