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Base field defined as entity reference with cardinality unlimited, only allowing one entry

I have defined a custom entity type "Event" and I want a field on it called "Attendees" which should allow the user to enter multiple attendees.

I have defined the field thus:

   $fields['attendees'] = BaseFieldDefinition::create('entity_reference')   ->setLabel(t('Attendees'))   ->setDescription(t('People attending this event.'))   ->setSetting('target_type', 'oc_actor')   ->setSetting('handler', 'default')   ->setTranslatable(TRUE)   ->setCardinality(BaseFieldDefinition::CARDINALITY_UNLIMITED)   ->setDisplayOptions('view', [     'type' => 'string',     'weight' => 50,   ])   ->setDisplayOptions('form', [     'type' => 'entity_reference_autocomplete_tags',     'weight' => 50,   ])   ->setRequired(FALSE);

However, the resulting field does not have unlimited cardinality. It only allows the user to enter one attendee. Compare and contrast with the "Test" field that I added beneath it using the GUI:

enter image description here

I have done a fresh install of the whole site since I last touched this code so it is not a matter of needing to add an update hook or clear the cache or anything like that.

Any ideas?

This article was republished from its original source.
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Base field defined as entity reference with cardinality unlimited, only allowing one entry

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