Fix observeOnce to unsubscribe properly #2140
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compulim
requested review from
a-b-r-o-w-n,
corinagum,
cwhitten,
justinwilaby and
tonyanziano
as code owners
corinagum
reviewed
Jul 3, 2019
| @@ -8,13 +8,11 @@ export default function observeOnceEffect(observable) { | |||
| return yield call( | |||
| () => | |||
| new Promise((resolve, reject) => { | |||
| observable.subscribe(resolve, reject); | |||
| subscription = observable.subscribe(resolve, reject, resolve); | |||
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Can you explain why next and complete are the same? to me it seems like this would make resolve be called twice. :/
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observeOnce is essentially converting a stream into an async binary operation (success or fail in async fashion, more-or-less Promise).
For "complete without any results", I think it should be considered as "positive with result of undefined".
corinagum
approved these changes
Jul 3, 2019
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Fixes #1872.
Changelog Entry
observeOnceto unsubscribe properly, by @compulim in PR #2140Description
Our
observeOncesaga effect does not unsubscribe itself from the observable. New code added to unsubscribe after firstonNext,onError, oronCompleted.Specific Changes
Modified
packages/core/src/sagas/effects/observeOnce.jsto unsubscribe regardless of conditions.