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Only return non-None task summaries for grid view #23924

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jedcunningham wants to merge 3 commits into from
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Only return non-None task summaries for grid view #23924

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Only return non-None task summaries for grid view
jedcunningham May 25, 2022
abfb033
Fix static checks
jedcunningham May 26, 2022
bc056ff
Update airflow/www/views.py
jedcunningham May 26, 2022
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6 changes: 5 additions & 1 deletion airflow/www/views.py
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Original file line number Diff line number Diff line change
Expand Up @@ -258,7 +258,11 @@ def task_group_to_grid(task_item_or_group, dag, dag_runs, session):
if isinstance(task_item_or_group, AbstractOperator):
return {
'id': task_item_or_group.task_id,
'instances': [wwwutils.get_task_summary(dr, task_item_or_group, session) for dr in dag_runs],
'instances': [
ts
for ts in [wwwutils.get_task_summary(dr, task_item_or_group, session) for dr in dag_runs]
if ts is not None
],
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Comment on lines +261 to +265

@dstandish dstandish May 26, 2022

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just to throw out another option,

Suggested change
'instances': [
ts
for ts in (wwwutils.get_task_summary(dr, task_item_or_group, session) for dr in dag_runs)
if ts is not None
],
'instances': filter(
lambda x: x is not None,
(wwwutils.get_task_summary(dr, task_item_or_group, session) for dr in dag_runs),
),

don't know if it also needs to be wrapped with list. i know we tend to prefer comprehension over map etc, but in this case it saves you that ts variable, which, since we're already iterating over DRs, is a tiny bit more cognitive load i thought.

@uranusjr uranusjr May 26, 2022 •
edited
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FWIW if we don’t need to care about empty summary (or if we’re OK to also filter those out), we can simply do

filter(None, (...))

But yes I believe an additional list call is necessary here, so comprehension is better IMO.

@dstandish dstandish May 26, 2022

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nice, i was thinking there must be a shorthand of some kind for this

@potiuk potiuk May 26, 2022

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Alternative fix here: #23932 - I think we shoudl slowly start add typing also to views.py as this precisely the kind of errors that would have been prevented if we had typing here in the first place.

@bbovenzi bbovenzi May 26, 2022

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More type checking is always nice. I've been meaning to add typescript to the UI.

@potiuk potiuk May 26, 2022

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More type checking is always nice. I've been meaning to add typescript to the UI.

Oh yeah. Absolutely. Typescript is soooo much better than plain javascript. One thing that it makes easier - is for anyone to contribute more fixes in an easy way. (once we have a built-in automation to transpile it, which is super-easy with yarn etc). I think lack of typing support, autocomplete and verification makes it really difficult for "newcomers" to reason about their changes and it's so much easier to contribute small fixes there.

You somehow loose that when you get familiar, when you put yourselve in the shoes of new contributor - it's a world of difference.

'label': task_item_or_group.label,
'extra_links': task_item_or_group.extra_links,
'is_mapped': task_item_or_group.is_mapped,
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