fleshgrinder/constraint-violations

This library provides an implementation of the Notification Pattern with additional functionality to keep code DRY and to be more useful in the context of Domain-Driven Design (DDD) and its value objects.

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PHP Constraint Violations

This library provides an implementation of the Notification Pattern with additional functionality to keep code DRY and to be more useful in the context of Domain-Driven Design (DDD) and its value objects., _(*2)

Installation

Open a terminal, enter your project directory and execute the following command to add this package to your dependencies:, _(*3)

$ composer require fleshgrinder/constraint-violations

This command requires you to have Composer installed globally, as explained in the installation chapter of the Composer documentation., _(*4)

Usage

Most basic usage is as illustrated in the following example:, _(*5)

$input = 'some data';
$errors = new ViolationCollector();
$warnings = new ViolationCollector();

if (some_validation($input) === false) {
    $errors->addViolation('some message');
}

if (some_other_validation($input) === false) {
    $warnings->addViolation('some other message');
}

// More validations ...

if ($warnings->hasViolations) {
    echo "WARNINGS\n";
    foreach ($warnings->getMessages() as $message) {
        echo "{$message}\n";
    }
}

if ($errors->hasViolations) {
    echo "ERRORS\n";
    foreach ($warnings->getMessages() as $message) {
        echo "{$message}\n";
    }
    exit(1);
}

// Continue ...

Please have a look at the wiki for more examples., _(*6)

Weblinks

• Martin Folwer: “Replacing Throwing Exceptions with Notification in Validations”, in martinfowler.com, December 9, 2014.

License

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