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Transformers take complex values and transform them into simple types. For example, a Carbon object could be transformed to 16-05-1994T00:00:00+00.

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Transformer Interface

Implement the Transformer interface: 
interface Transformer
{
    public function transform(DataProperty $property, mixed $value, TransformationContext $context): mixed;
}

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Parameters

  • property - DataProperty object representing the property being transformed (read more)
  • value - The value to transform (never null)
  • context - TransformationContext containing:
    • transformValues - Whether values should be transformed
    • mapPropertyNames - Whether property names should be mapped
    • wrapExecutionType - The execution type for wrapping values
    • transformers - Collection of available transformers

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Return Value

Return the transformed value.

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Example Transformer

use Spatie\LaravelData\Transformers\Transformer;
use Spatie\LaravelData\Support\DataProperty;
use Spatie\LaravelData\Support\Transformation\TransformationContext;

class DateTimeTransformer implements Transformer
{
    public function transform(DataProperty $property, mixed $value, TransformationContext $context): string
    {
        return $value->format('Y-m-d H:i:s');
    }
}
Use in your data class: 
use Spatie\LaravelData\Attributes\WithTransformer;

class SongData extends Data
{
    public function __construct(
        public string $title,
        #[WithTransformer(DateTimeTransformer::class)]
        public DateTime $releasedAt,
    ) {
    }
}

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Combining Transformers and Casts

Create a class that both transforms and casts: 
class ToUpperCastAndTransformer implements Cast, Transformer
{
    public function cast(DataProperty $property, mixed $value, array $properties, CreationContext $context): string
    {
        return strtoupper($value);
    }
    
    public function transform(DataProperty $property, mixed $value, TransformationContext $context): string
    {
        return strtoupper($value);
    }
}
Use with the WithCastAndTransformer attribute: 
class SongData extends Data
{
    public function __construct(
        public string $title,
        #[WithCastAndTransformer(ToUpperCastAndTransformer::class)]
        public string $artist,
    ) {
    }
}

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