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john Smith avatar Drupal

FieldItemList::getValue always returns a string, even for a Boolean field

gr flag
john Smith

Supposed I added a custom Boolean field, whose cardinality is 1, to a content type. I create a node of that content type, enter a value for that field (for example, TRUE), and save the node.

When I get the field value with $value = node->get('field_custom')->getValue(); $value contains the following array.

0 => array (1)
  value => string (1) "1"

Is there an way to get the field value that reflects the field type, Boolean in this case?

0 => array (1)
  value => boolean true

I manually cast the value, for example with code similar to the following one.

// Boolean
$value = (boolean) $value;

// Integer
$value = intval($value);

I also tried get('x')->value and using __get().

Drupal knows the field type, which is returned from $field->getFieldDefinition()->getType(). I take there is a way to correctly cast the field value.

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Kevin avatar
in flag
Kevin
Values are not cast on return by Drupal.
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Kevin avatar
in flag
Kevin
You could cast as `$value = (boolean) $value;`
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Score:3
4uk4 avatar Drupal
cn flag
4uk4

Normally type casting doesn't matter: https://softwareengineering.stackexchange.com/questions/24378/type-casting-variables-in-php-what-is-the-practical-reason-for-doing-this.

So retrieving an entity field value doesn't need to be type casted:

$node->field_bool->value

returns a string '0'/'1' or NULL if the field is empty. All three possible values work as expected in PHP. '1' results in logical true and the other two values in logical false. This reflects how it is visible in UI where a checkbox can only have two states. Empty is unchecked, checked is saved as '1' and when unchecked again it is saved as '0'.

However, the Drupal entity system is built on typed data and if you want to write OOP code with type casting, you can:

$node->field_bool->first()->get('value')->getCastedValue()

returns FALSE/TRUE.

Caveat: This doesn't work on field level. You need to get a field item to get the boolean typed data and you have to catch an empty field to avoid get() on NULL.

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john Smith avatar
gr flag
john Smith
Thank you very much for ur answer, I totally agree, especially with the "normally". So for my case this is very helpful and works good for primitive like integer, float boolean and string wont cast a datetime
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4uk4 avatar
cn flag
4uk4
To *cast* a date object replace getCastedValue() with [DateTimeIso8601::getDateTime()](https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21TypedData%21Type%21DateTimeInterface.php/function/DateTimeInterface%3A%3AgetDateTime/9.2.x).
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