I have an entity type animal with the following bundles:
In the Animal.php entity type definition, I create some base fields, one of which is an entity reference to Habitat.
BaseFieldDefinition::create('entity_reference') ->setLabel(t('Habitat ID')) ->setCardinality(1) ->setSetting('target_type', 'habitat') ->setDisplayConfigurable('form', FALSE) ->setDisplayConfigurable('view', TRUE);
I want to require this entity reference for cows and pigs, but I don't want it to be required for sparrows and anteaters.
So, I can't use
BaseFieldDefinition::create() because that will apply to all the bundles.
What's the simplest way to require a field created by
BaseFieldDefinition::create() in some bundles but not others?