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Example code of othercodes/ddd-value-object

Informations about the package ddd-value-object

DDD Value Object

Tests License codecov

Small library to easily manage the Value Object Pattern.

Installation

Use the following command to install with composer:

This will automatically get the latest version and configure a composer.json file.

Alternatively you can create the following composer.json file and run composer install to install it.

Usage

Build a Value object is quite simple, you just need to extend the ValueObject Next, initialize the values in the constructor by using the initialize method. Finally, add invariant rules as protected method, using the prefix invariant (this prefix can be customized) and execute them with the checkInvariants method.

Equality

Value equality is computed by serializing the object and hashing it with the sha256 algorithm. Alternatively, you can override equalityHash to calculate a proper hash for the object. This hash is used to check if the value objects are equals or not.

Immutability

The immutability property blocks any attempt of value modification, that will end in exception:

You can customize the exception that will be thrown by overriding the immutabilityException property. The same happens with the error message, you just need to override the immutabilityMessages property.

Invariants

The invariants methods must return a boolean value, true if the invariant is successfully, false otherwise. If any in variant is violated you will get an exception:

By default, the invariant name is parsed and used as message error on invariant violation, but this can be easily customized, you just need to throw an exception with your custom message instead returning false in the invariants:

Additionally, you can fully customize how the invariant violation are managed by passing a custom function to the checkInvariants method:

All versions of ddd-value-object with dependencies

PHP Build Version
Package Version
Requires ext-json Version *
ramsey/uuid Version ^4.1
nesbot/carbon Version ^2.40
konekt/enum Version ^3.0
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