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<?php |
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namespace JD\FormBundle\Form\DataTransformer; |
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use Doctrine\Common\Persistence\ObjectRepository; |
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use Symfony\Component\Form\DataTransformerInterface; |
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use Symfony\Component\Form\Exception\TransformationFailedException; |
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use Symfony\Component\PropertyAccess\PropertyAccess; |
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final class EntityToIdTransformer implements DataTransformerInterface |
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{ |
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/** |
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* @var string |
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*/ |
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private $class; |
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/** |
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* @var string |
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*/ |
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private $property; |
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/** |
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* @var ObjectRepository |
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*/ |
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private $repository; |
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/** |
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* @param ObjectRepository $repository |
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* @param string $class |
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* @param string $property |
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*/ |
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public function __construct(ObjectRepository $repository, $class, $property = 'id') |
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{ |
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$this->class = $class; |
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$this->property = $property; |
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$this->repository = $repository; |
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} |
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/** |
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* Transforms a value from the original representation to a transformed representation. |
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* |
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* This method is called on two occasions inside a form field: |
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* |
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* 1. When the form field is initialized with the data attached from the datasource (object or array). |
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* 2. When data from a request is submitted using {@link Form::submit()} to transform the new input data |
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* back into the renderable format. For example if you have a date field and submit '2009-10-10' |
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* you might accept this value because its easily parsed, but the transformer still writes back |
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* "2009/10/10" onto the form field (for further displaying or other purposes). |
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* |
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* This method must be able to deal with empty values. Usually this will |
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* be NULL, but depending on your implementation other empty values are |
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* possible as well (such as empty strings). The reasoning behind this is |
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* that value transformers must be chainable. If the transform() method |
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* of the first value transformer outputs NULL, the second value transformer |
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* must be able to process that value. |
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* |
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* By convention, transform() should return an empty string if NULL is |
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* passed. |
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* |
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* @param mixed $entity The value in the original representation |
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* |
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* @return mixed The value in the transformed representation |
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* |
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* @throws TransformationFailedException When the transformation fails. |
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*/ |
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public function transform($entity) |
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{ |
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if (null === $entity) { |
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return; |
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} |
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$accessor = PropertyAccess::createPropertyAccessor(); |
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return $accessor->getValue($entity, $this->property); |
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} |
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/** |
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* Transforms a value from the transformed representation to its original |
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* representation. |
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* |
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* This method is called when {@link Form::submit()} is called to transform the requests tainted data |
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* into an acceptable format for your data processing/model layer. |
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* |
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* This method must be able to deal with empty values. Usually this will |
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* be an empty string, but depending on your implementation other empty |
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* values are possible as well (such as empty strings). The reasoning behind |
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* this is that value transformers must be chainable. If the |
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* reverseTransform() method of the first value transformer outputs an |
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* empty string, the second value transformer must be able to process that |
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* value. |
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* |
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* By convention, reverseTransform() should return NULL if an empty string |
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* is passed. |
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* |
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* @param mixed $identifier The value in the transformed representation |
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* |
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* @return object|null The value in the original representation |
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* |
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* @throws TransformationFailedException When the transformation fails. |
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*/ |
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public function reverseTransform($identifier) |
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{ |
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if (!$identifier) { |
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return; |
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} |
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$entity = $this->repository->find($identifier); |
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if (null === $entity) { |
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throw new TransformationFailedException(); |
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} |
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return $entity; |
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} |
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} |
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juliendufresne /
JDFormBundle
