I have a standard config entity in Drupal 8. I'm trying to save multiple values in the form of checkboxes.

The form itself looks like this: enter image description here

As you can see it's nothing to special about it.

If I try to save it, the following exception occurs:

InvalidArgumentException: The configuration property user_role.anonymous doesn't exist. in Drupal\Core\Config\Schema\ArrayElement->get() (line 74 of core/lib/Drupal/Core/Config/Schema/ArrayElement.php).

Drupal\Core\Config\StorableConfigBase->castValue('user_role.anonymous', 'anonymous') (Line: 211)
Drupal\Core\Config\StorableConfigBase->castValue('user_role', Array) (Line: 212)
Drupal\Core\Config\Config->save() (Line: 280)
Drupal\Core\Config\Entity\ConfigEntityStorage->doSave('pl_n_6467f20669ddf097337c47aab87e3c', Object) (Line: 392)
Drupal\Core\Entity\EntityStorageBase->save(Object) (Line: 259)
Drupal\Core\Config\Entity\ConfigEntityStorage->save(Object) (Line: 364)
Drupal\Core\Entity\Entity->save() (Line: 637)
Drupal\Core\Config\Entity\ConfigEntityBase->save() (Line: 130)
Drupal\pl_notifications\Form\PLNotificationsConfigurationForm->save(Array, Object)
call_user_func_array(Array, Array) (Line: 111)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 585)
Drupal\Core\Form\FormBuilder->processForm('p_l_notifications_configuration_add_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm('p_l_notifications_configuration_add_form', Object) (Line: 74)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
call_user_func_array(Object, Array) (Line: 144)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Which makes perfect sense since I haven't defined that field in the ConfigEntityType.

However I can't defined it since there may be other roles added later on or rather some other roles removed.

My question is: How can I save multiple values in a config entity?

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Config (schema) defines two basic types of complex/array definitions.

Mapping: When you have limited, known set of keys, each with a specific type, e.g. a few strings, integers, booleans and so on.

Sequence: When you have a unlimited list of values that all have the same type but with unknown or numeric keys. Each element must have the same type. The top level in a config entity and simple config is always a mapping (the type there is a config_object or config_entity or so, but those all extend from mapping)

In your example, you would define the user roles as type sequence in config schema, and as a standard php array in your config entity class.

You can also combine this in any way you can imagine, you have a mapping, one key is a list, each element is a mapping, and so on.

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In case anybody has this problem too.

I ended up serializing the values and saving them as a single field.

I don't know if that is the best approach for it but it works for now.

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