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fix: infer email_cadence channel for v3 notification preference PUTs - #39241

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mvanhorn:fix/39221-v3-notification-preferences-email-cadence
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mvanhorn:fix/39221-v3-notification-preferences-email-cadence

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Description

A v3 notification-preference update that sends an email cadence and omits the channel returns HTTP 500. Validation accepts the body, then the request fails before the preference is saved. The same cadence update succeeds when the channel is included. The update serializer treats a present email cadence as a substitute for the channel, and the success response already fills the channel in as email_cadence in that case. The code that builds the saved update and the preference-update event still reads the channel key directly, so a cadence-only body raises KeyError before anything is written.

The view now resolves one channel for the request: it keeps an explicit channel, and treats a body that only supplies a cadence as the email_cadence channel. That value is used for the preference update, the analytics event, and the response. A cadence-only update is rejected with 400 when that notification type's email channel is not editable. When the resolved channel is email_cadence, the response reports the cadence, including when the body also contains a boolean value.

Fixes #39221

Supporting information

Not applicable to this change.

Testing instructions

npm test could not run in this environment for the openedx-platform NotificationPreferencesViewV3 change (jest is not installed).
Tests for the openedx-platform NotificationPreferencesViewV3 change live in openedx/core/djangoapps/notifications/tests/test_views.py.

Deadline

"None" if there's no rush, or provide a specific date or event (and reason) if there is one.

Other information

Not applicable to this change.

The view now resolves one channel for the request: it keeps an explicit
channel, and treats a body that only supplies a cadence as the
email_cadence channel. That value is used for the preference update, the
analytics event, and the response. A cadence-only update is rejected
with 400 when that notification type's email channel is not editable.
When the resolved channel is email_cadence, the response reports the
cadence, including when the body also contains a boolean value.

Fixes openedx#39221
@openedx-webhooks openedx-webhooks added the open-source-contribution PR author is not from Axim or 2U label Oct 16, 2026
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Thanks for the pull request, @mvanhorn!

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v3 notification preferences: PUT with email_cadence but no notification_channel raises KeyError (500)

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