(This is a similar issue as #2706593: Opt-in confirmation mail is sent every time user_save() is called for users with pending status → , but for D8.)
I have a MailChimp subscription field configured on the user entity, and configured the field to be double opt-in. In a custom module, I am adding a role to every new user in hook_user_insert(), including calling $user->save(). This results in the user receiving two Mailchimp opt-in emails: one that's triggered by the initial creation of the new user account, and one that's triggered by the call to $user->save() in custom code.
Attached patch does the following:
- Adds a 'Prevent multiple subscriptions' setting to the subscribe field.
- If that setting is enabled, \Drupal\mailchimp_lists\Plugin\Field\FieldType\MailchimpListsSubscription::preSave will check the Mailchimp member info for the user's email address. If the Mailchimp member has a 'pending' status (i.e., if Mailchimp is waiting for a confirmation from the user), the user won't be subscribed a second time, and won't get a second (or third, fourth, ...) opt-in email.
I'm not sure if this is the best/cleanest/... way to solve this, feedback welcome :)
Closed: won't fix
1.0
Lists Module
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
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