DTO Mapper

About

This class helps to map any class or associative array tree into DTO class tree.

It uses reflection to create DTOs but calls getters or reads properties to get values from source tree and only properties found in DTO will be fetched from source object. This makes mapper work fine e.g. with doctrine lazy loads.

For object object if key property property is required, following sources will be checked:

• object->propery
• object[property]
• object->getPropery()
• object->isPropery()
• object->hasPropery()
• object->propery()
• object->__call('property')

All method calls are case-insensitive.

DTOs must have all their properties typed and all array properties should have phpDoc specifying item types.

Installation

The preferred way to install this extension is through composer.

Run

composer require onmoon/dto-mapper

Usage

public function showPetById(int $petId) : ShowPetByIdResponseDto
{
    $pet   = $this->pets->getById($petId);

    $mapper = new OnMoon\DtoMapper\DtoMapper();
    return $mapper->map($pet, ShowPetByIdResponseDto::class);
}

DateTime handling

DateTime class does not support creation with reflection. If DTO property is subclass of DateTimeInterface then this property is set to new \Safe\DateTime instance. Source values for DateTime can be both DateTimeInterface and string.

Rewriting source properties

By default, mapper searches for the same property in source as in DTO. If you want to read value for some property from another source property, you can pass a callable object as third argument. This callable should always return mapped property name.

$mapper->map($pet, ShowPetByIdResponseDto::class, function ($propertyName, $context) { 
    $fullName = implode('->', [...$context, $propertyName]);
    if ($fullName === 'subObject->s2->property1') {
       return 'realProperty1';
    }
    return $propertyName;
});