FieldStorageConfig::getSchema

public FieldStorageConfig::getSchema()

Returns the field schema.

Note that this method returns an empty array for computed fields which have no schema.

Return value

array[] The field schema, as an array of key/value pairs in the format returned by \Drupal\Core\Field\FieldItemInterface::schema():

• columns: An array of Schema API column specifications, keyed by column name. This specifies what comprises a single value for a given field. No assumptions should be made on how storage backends internally use the original column name to structure their storage.
• indexes: An array of Schema API index definitions. Some storage backends might not support indexes.
• unique keys: An array of Schema API unique key definitions. Some storage backends might not support unique keys.
• foreign keys: An array of Schema API foreign key definitions. Note, however, that depending on the storage backend specified for the field, the field data is not necessarily stored in SQL.

Overrides FieldStorageDefinitionInterface::getSchema

File

core/modules/field/src/Entity/FieldStorageConfig.php, line 441

Class

FieldStorageConfig

Defines the Field storage configuration entity.

Namespace

Drupal\field\Entity

Code

public function getSchema() {
  if (!isset($this->schema)) {
    // Get the schema from the field item class.
    $class = $this->getFieldItemClass();
    $schema = $class::schema($this);
    // Fill in default values for optional entries.
    $schema += array(
      'columns' => array(),
      'unique keys' => array(),
      'indexes' => array(),
      'foreign keys' => array(),
    );

    // Merge custom indexes with those specified by the field type. Custom
    // indexes prevail.
    $schema['indexes'] = $this->indexes + $schema['indexes'];

    $this->schema = $schema;
  }

  return $this->schema;
}