FieldStorageConfig::$locked
Flag indicating whether the field is available for editing.
If TRUE, some actions not available though the UI (but are still possible through direct API manipulation):
- field settings cannot be changed,
 - new fields cannot be created
 - existing fields cannot be deleted.
 
Defaults to FALSE.
Type: bool
File
- 
              core/
modules/ field/ src/ Entity/ FieldStorageConfig.php, line 155  
Class
- FieldStorageConfig
 - Defines the Field storage configuration entity.
 
Namespace
Drupal\field\EntityCode
protected $locked = FALSE;
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