EAV

Entity-Attribute-Value (EAV)

The Entity–attribute–value (EAV) pattern in order to implement EAV model with PHP.

Purpose

The Entity–attribute–value (EAV) model is a data model to describe entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest.

Examples

Check full work example in example.php file.

use DesignPatterns\More\EAV\Entity;
use DesignPatterns\More\EAV\Attribute;
use DesignPatterns\More\EAV\Value;

// Create color attribute
$color = (new Attribute())->setName('Color');
// Create color values
$colorSilver    = (new Value($color))->setName('Silver');
$colorGold      = (new Value($color))->setName('Gold');
$colorSpaceGrey = (new Value($color))->setName('Space Grey');

// Create memory attribute
$memory  = (new Attribute())->setName('Memory');
// Create memory values
$memory4Gb  = (new Value($memory))->setName('4GB');
$memory8Gb  = (new Value($memory))->setName('8GB');
$memory16Gb = (new Value($memory))->setName('16GB');

// Create storage attribute
$storage  = (new Attribute())->setName('Storage');
// Create storage values
$storage128Gb   = (new Value($storage))->setName('128GB');
$storage256Gb   = (new Value($storage))->setName('256GB');
$storage512Gb   = (new Value($storage))->setName('512GB');
$storage1Tb     = (new Value($storage))->setName('1TB');

// Create entities with specific values
$mac = (new Entity())
    ->setName('MacBook')
    // colors
    ->addValue($colorSilver)
    ->addValue($colorGold)
    ->addValue($colorSpaceGrey)
    // memories
    ->addValue($memory8Gb)
    // storages
    ->addValue($storage256Gb)
    ->addValue($storage512Gb)
;

$macAir = (new Entity())
    ->setName('MacBook Air')
    // colors
    ->addValue($colorSilver)
    // memories
    ->addValue($memory4Gb)
    ->addValue($memory8Gb)
    // storages
    ->addValue($storage128Gb)
    ->addValue($storage256Gb)
    ->addValue($storage512Gb)
;

$macPro = (new Entity())
    ->setName('MacBook Pro')
    // colors
    ->addValue($colorSilver)
    // memories
    ->addValue($memory8Gb)
    ->addValue($memory16Gb)
    // storages
    ->addValue($storage128Gb)
    ->addValue($storage256Gb)
    ->addValue($storage512Gb)
    ->addValue($storage1Tb)
;

UML Diagram

Code

You can also find these code on GitHub

Test

Tests/EntityTest.php

.. literalinclude:: Tests/EntityTest.php
   :language: php
   :linenos:

Tests/AttributeTest.php

.. literalinclude:: Tests/AttributeTest.php
   :language: php
   :linenos:

Tests/ValueTest.php

.. literalinclude:: Tests/ValueTest.php
   :language: php
   :linenos: