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I have a need to track changes to users in a separate database, apart from Drupal. When a user changes their email address or their password, I need to communicate that change with a shadow table in MSSQL.

I've created an event and listener. The event is triggered by hook_entity_update. That works fine, but I don't know what was changed in that request. Is there a way to pass the value that was changed to that event listener?

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Per the hook_entity_update() documentation:

This hook runs once the entity storage has been updated. Note that hook implementations may not alter the stored entity data. Get the original entity object from $entity->original.

In your event listener, you can compare the email/password fields on $entity & $entity->original to check if they have changed.

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  • Thanks, Shawn. I overlooked the $entity->original yesterday. That gets me what I need.
    – jscrilla
    Aug 18 '20 at 13:43

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