Yii2 View Presenters

So you have those scenarios where a bit of logic needs to be performed before some data (likely from your entity) is displayed from the view.

• Should that logic be hard-coded into the view? No.
• Should we instead store the logic in the model? No again!

Instead, leverage view presenters. That's what they're for! This package provides one such implementation.

Installation

Run the Composer command to install the latest stable version:

composer require frostealth/yii2-presenter @stable

Usage

The first step is to store your presenters somewhere - anywhere. These will be simple objects that do nothing more than format data, as required.

Here's an example of a presenter.

namespace app\presenters;

use app\models\User;
use frostealth\yii2\presenter\Presenter;

/**
 * Class ConcreteEntityPresenter
 *
 * @property User   $entity
 *
 * @property-read string $firstName
 * @property-read string $lastName
 * @property-read string $fullName
 * @property-read string $birthDate
 */
class UserPresenter extends Presenter
{
    /**
     * @return string
     */
    public function getFullName()
    {
        return implode(' ', [$this->firstName, $this->lastName]);
    }

    /**
     * @return string
     */
    public function getBirthDate()
    {
        return date('y.M.d', $this->entity->birthDate);
    }

    /**
     * @inheritdoc
     * @see \yii\base\Arrayable::fields()
     * @link http://www.yiiframework.com/doc-2.0/guide-rest-resources.html#fields
     */
    public function fields()
    {
        $fields = parent::fields();
        $fields[] = 'fullName';

        return $fields;
    }
}

Next, on your entity, pull in the frostealth\yii2\presenter\traits\PresentableTrait trait, which will automatically instantiate your presenter class.

Here's an example of an presentable model.

namespace app\models;

use app\presenters\UserPresenter;
use frostealth\presenter\interfaces\PresentableInterface;
use frostealth\yii2\presenter\traits\PresentableTrait;

/**
 * Class User
 *
 * @property string $firstName
 * @property string $lastName
 * @property string $birthDate
 * @property string $passwordHash
 * @property string $passwordResetToken
 *
 * @method UserPresenter presenter()
 */
class User extends ActiveRecord implements PresentableInterface
{
    use PresentableTrait;

    /**
     * @inheritdoc
     * @see \yii\base\Arrayable::fields()
     * @link http://www.yiiframework.com/doc-2.0/guide-rest-resources.html#fields
     */
    public function fields()
    {
        $fields = parent::fields();
        unset($fields['passwordHash'], $fields['passwordResetToken']);

        return $fields;
    }

    /**
     * @return string|array
     */
    protected function getPresenterClass()
    {
        return 'app\presenters\UserPresenter';
    }
}

Now, within your view, you can do:

<dl>
    <dt>Name</dt>
    <dd><?= $model->presenter()->fullName ?></dd>

    <dt>Birth Date</dt>
    <dd><?= $model->presenter()->birthDate ?></dd>
</dl>

Yii2 REST

Here's an example of an controller.

namespace app\controllers;

use yii\rest\ActiveController;

class UserController extends ActiveController
{
    /** @inheritdoc */
    public $serializer = 'frostealth\yii2\presenter\rest\Serializer';

    /** @inheritdoc */
    public $className = 'app\models\User';
}

License

The MIT License (MIT). See LICENSE.md for more information.