Voilab Mapping system

Install

Via Composer

Create a composer.json file in your project root:

{
    "require": {
        "voilab/mapping": "1.*"
    }
}

$ composer require voilab/mapping

Sample dataset

// have a mapping instance
$mapping = new \voilab\mapping\Mapping();

// have a set of datas. This could also be an object with
// methods like getName(), getInterests(), etc.
$data = [
    'id' => 1,
    'name' => 'John',
    'email' => 'john@doe.ch',
    'interests' => [
        [
            'type' => 'intellect',
            'description' => 'Some book',
            'contact' => [
                'name' => 'Some author'
            ]
        ],
        [
            'type' => 'sport',
            'description' => 'Football'
        ]
    ],
    'bestFriend' => [
        'id' => 2,
        'name' => 'Fred'
        'age' => 30
    ],
    'work' => [
        'description' => 'Free worker',
        'section' => [
            'type' => 'Social'
        ]
    ]
];

Examples

This piece of script helps you to obtain a constant output structure no matter how the input data is hydrated (array or object).

Simple mapping

$mapped = $mapping->map($data, [
    'id',
    'name'
]);

// results in
[
    'id' => 1,
    'name' => 'John'
]

Function call mapping

$mapped = $mapping->map($data, [
    'id',
    'email' => function ($data) {
        return $data['email'] == 'john@doe.ch'
            ? 'some.default@email.ch'
            : $data['email'];
    }
]);

// results in
[
    'id' => 1,
    'email' => 'some.default@email.ch'
]

One-to-one or many-to-one relation mapping

$mapped = $mapping->map($data, [
    'work' => [
        'section' => [
            'type'
        ]
    ]
]);

// results in
[
    'work' => [
        'section' => [
            'type' => 'Social'
        ]
    ]
]

One-to-many or many-to-many relation mapping

$mapped = $mapping->map($data, [
    'interests' => [[
        'description'
    ]]
]);

// results in
[
    'interests' => [
        ['description' => 'Some book'],
        ['description' => 'Football']
    ]
]

Complex relation mapping

$mapped = $mapping->map($data, [
    'interests' => [[
        'contact' => [
            'name'
        ]
    ]]
]);

// results in
[
    'interests' => [
        ['contact' => [
            'name' => 'Some author'
        ]],
        ['contact' => null]
    ]
]

Change mapping key

$mapped = $mapping->map($data, [
    'id',
    'personName' => 'name'
]);

// results in
[
    'id' => 1,
    'personName' => 'John'
]

Change relation mapping key

$mapped = $mapping->map($data, [
    \voilab\mapping\Mapping::rel('work', 'nextWork') => [
        'description'
    ]
]);

// results in
[
    'nextWork' => [
        'description' => 'Free worker'
    ]
]

As an alternative, you may use this notation below. Code should not change anytime soon.

$mapped = $mapping->map($data, [
    'work as nextWork' => [
        'description'
    ]
]);

Wildcard mapping

It's experimental with objects.

$mapped = $mapping->map($data, [
    'name',
    'bestFriend' => [
        '*'
    ]
]);

// results in
[
    'name' => 'John',
    'bestFriend' => [
        'id' => 2,
        'name' => 'Fred'
        'age' => 30
    ]
]

Advanced function mapping usage

You may want to access the current index inside your function if you are inside a collection. It's as easy as:

$special_for_interest = [
    ['data' => 1],
    ['data' => 2]
];

$mapped = $mapping->map($data, [
    'interests' => [[
        'description',
        'special' => function ($interest, $index) use ($special_for_interest) {
            return $special_for_interest[$index]['data'];
        },
        'contact' => [
            'name' => function ($contact, $index, $indexes, $parents) {
                // if you want to access the parent interest. The first parent
                // is the top parent: 0 => main data, 1 => interest
                return $contact['name'] . ' for ' . $parents[1]['description'];
            }
        ]
    ]]
]);

// results in
[
    'interests' => [
        [
            'description' => 'Some book',
            'special' => 1,
            'contact' => [
                'name' => 'Some author for Some book'
            ]
        ],
        [
            'description' => 'Football',
            'special' => 2,
            'contact' => null
        ]
    ]
]

Hydrators

Hydrators are objects that extract data from the initial source. Two defaults, packaged in this lib, are for array management and simple objects (with getters and setters camelcased).

Change hydrators

If your data needs to be handled differently, you will need to create your own hydrators (which must extend \voilab\mapping\Hydrator) and then set them at construction time:

$mapping = new \voilab\mapping\Mapping(
    new \my\object\Hydrator(),
    new \my\array\Hydrator()
);

Please check packaged hydrators sources to see how it works. It's quite simple.

Plugins

Introduction

Configuration

The plugin "Deep one-to-one or many-to-one relation mapping" is always active. If you want to add other plugins, just do this when initializing the mapping object:

$mapping->addPlugin(new \voilab\mapping\plugin\FirstInCollection());

Disable plugin management

If you don't want to call any plugin (even the default one), simply set the plugin key separator to null.

$mapping->setPluginKeySeparator(null);

Deep one-to-one or many-to-one relation mapping

Goes through a tree of one-to-one or many-to-one relations, until it reaches the key (here: type for section and name for interests).

$mapped = $mapping->map($data, [
    'sectionType' => 'work.section.type',
    'interests' => [[
        'contactName' => 'contact.name'
    ]]
]);

// results in
[
    'sectionType' => 'Social',
    'interests' => [
        ['contactName' => 'Some author']
        ['contactName' => null]
    ]
]

Deep first one-to-many or many-to-many relation mapping

When encountering a one-to-many or many-to-many relation, it fetch the 1st element in the collection, and then tries to fetch the other relations, before accessing the key (here: name).

$mapping->addPlugin(new \voilab\mapping\plugin\FirstInCollection());

$mapped = $mapping->map($data, [
    'firstInterestContactName' => 'interests[].contact.name'
]);

// results in
[
    'firstInterestContactName' => 'Some author'
]

Testing

$ phpunit

Security

If you discover any security related issues, please use the issue tracker.

Credits

• tafel
• voilab

License

The MIT License (MIT). Please see License File for more information.