Attribute Model

A sort-of-kind-of ActiveModel type'ish base for Models that rely on an array of attributes. Includes a type-casting sub-system for casting attributes to values. Extracted from read-models.

The focus is for creating read-only Model representations for use in presentation layers. This library is used by somnambulist/read-models and api-client.

Requirements

PHP 8.1+
pragmarx/ia-str

Installation

Install using composer, or checkout / pull the files from github.com.

composer require somnambulist/attribute-model

Usage

Extend to a model e.g. User; or implement into a base model and add extra functionality. Use attribute casting if needed before passing attributes into the model.

<?php
use Somnambulist\Components\AttributeModel\AbstractModel;
use Somnambulist\Components\AttributeModel\AttributeCaster;
use Somnambulist\Components\AttributeModel\TypeCasters\AreaCaster;
use Somnambulist\Components\AttributeModel\TypeCasters\MoneyCaster;

class User extends AbstractModel
{

}

$caster = new AttributeCaster([
    new AreaCaster(),
    new MoneyCaster(),
]);
$attrs = [];
$user = new User($caster->cast($attrs, ['area' => 'area', 'money' => 'money',]));

Built-in Casters

The following casters are built-in and are largely configurable by type or attribute name(s):

Caster	Output	Comments
AreaCaster	Somnambulist\Components\Models\Types\Measure\Area	convert a value + unit to an Area value object
CoordinateCaster	Somnambulist\Components\Models\Types\Geography\Coordinate	convert lat/long/srid strings to value object
DateTimeCaster	Somnambulist\Components\Models\Types\DateTime\DateTime	convert a date/time in a format to a DateTime object
DistanceCaster	Somnambulist\Components\Models\Types\Measure\Distance	convert a value + unit to a Distance value object
EnumCaster	BackedEnum	returns a PHP 8.1 backed enum
EnumerableKeyCaster	Somnambulist\Components\Models\AbstractEnumeration	returns instantiated enumeration object using the member key; may also be a multiton
EnumerableValueCaster	Somnambulist\Components\Models\AbstractEnumeration	returns instantiated enumeration object using the member value
ExternalIdentityCaster	Somnambulist\Components\Models\Identity\ExternalIdentity	decodes a JSON string into an ExternalIdentity value object
JsonArrayCaster	array	decodes a JSON string into a simple array
JsonCollectionCaster	Somnambulist\Collection\MutableCollection	decodes a JSON string into a collection object
MoneyCaster	Somnambulist\Components\Models\Types\Money\Money	convert a value + ISO currency to value object
SimpleValueObjectCaster	Somnambulist\Components\Models\AbstractValueObject	creates value-objects from a single string value e.g. EmailAddress

Many of the casters accept alternative attribute names for matching and type overrides. Suitable defaults are provided where appropriate (e.g.: json, json_array, json_collection).

More casters can be added by implementing the interface and attaching to the AttributeCaster.

An existing caster can be re-used on another type by calling $caster->extend(<type>, [new, types, here]). The configuration of the caster cannot be changed; it adds extra type keys that the caster will respond to.

Tests