public FieldConfigInterface::setPropertyConstraints($name, array $constraints)
Sets constraints for a given field item property.
Note: this overwrites any existing property constraints. If you need to add to the existing constraints, use \Drupal\Core\Field\FieldConfigInterface::addPropertyConstraints()
Note that constraints added via this method are not stored in configuration and as such need to be added at runtime using hook_entity_bundle_field_info_alter().
string $name: The name of the property to set constraints for.
array $constraints: The constraints to set.
static The object itself for chaining.
hook_entity_bundle_field_info_alter()
public function setPropertyConstraints($name, array $constraints);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldConfigInterface.php/function/FieldConfigInterface::setPropertyConstraints/8.1.x