Content management system for Yii2

This extension provides content management system for Yii2.

For license information check the LICENSE-file.

Installation

The preferred way to install this extension is through composer.

Either run

php composer.phar require --prefer-dist yii2tech/content

or add

"yii2tech/content": "*"

to the require section of your composer.json.

Usage

This extension provides basic content management system for Yii2. There is a common task to provide ability for application administrator to change site content, like static pages ('About us', 'How it works' and so on), email templates and so on. This task is usually solved by developer using a dedicated database entities (tables) to store static page or email template contents. However using just database entities creates a several problems like defining default (pre-filled) data or updating existing application. In case you need to setup a default pre-set for static pages, so the deployed application does not look empty or add extra static page to the existing site with pre-filled content, you'll need to manipulate database records using DB migration mechanism or something. This is not very practical - it would be better to be able to control list of static pages or email templates inside program code under the VSC (Git, Mercurial etc).

This extension solves the content management task using 'override' principle: the default set of content is defined by the source code files, while there is an ability to override default contents using database storage.

This extension provides a special Yii application component - [[\yii2tech\content\Manager]], which provides high level interface for content management. Manager operates by 2 content storages:

[[\yii2tech\content\Manager::$sourceStorage]] - uses project source files as a default contents source
[[\yii2tech\content\Manager::$overrideStorage]] - uses DBMS storage to override source contents

Application configuration example:

return [
    'components' => [
        'pageContentManager' => [
            'class' => 'yii2tech\content\Manager',
            'sourceStorage' => [
                'class' => 'yii2tech\content\PhpStorage',
                'filePath' => '@app/data/pages',
            ],
            'overrideStorage' => [
                'class' => 'yii2tech\content\DbStorage',
                'table' => '{{%Page}}',
                'contentAttributes' => [
                    'title',
                    'body',
                ],
            ],
        ],
    ],
    // ...
];

In this example default contents for the static pages located in the project files under directory '@app/data/content'. Each record is represented by the separated file, like following:

<?php
// file '@app/data/pages/about.php'
return [
    'title' => 'About',
    'body' => 'About page content',
];

The override contents will be stored in the database table 'Page', which can be created using following DB migration:

class m??????_??????_createPage extends yii\db\Migration
{
    public function safeUp()
    {
        $tableName = 'Page';
        $columns = [
            'id' => $this->string(),
            'title' => $this->string(),
            'body' => $this->text(),
            'PRIMARY KEY([[id]])',
        ];
        $this->createTable($tableName, $columns);
    }

    public function safeDown()
    {
        $this->dropTable('Page');
    }
}

During the 'About' page rendering you should use abstraction provided by [[\yii2tech\content\Manager]]. Method [[\yii2tech\content\Manager::get()]] returns the content set for particular entity (e.g. particular page), holding all related content parts: 'title', 'body' and so on. For example:

<?php
// file '@app/views/site/about.php'

use yii\bootstrap\Html;

/* @var $this yii\web\View */
/* @var $contentManager yii2tech\content\Manager */

$contentManager = Yii::$app->get('pageContentManager');
$contentItem = $contentManager->get('about');

$this->title = $contentItem->render('title');
?>
<div class="site-about">
    <?= $contentItem->render('body') ?>
</div>

In case there is a record in 'Page' table with 'id' equal to 'about', the data from this record will be rendered, otherwise the data from '@app/data/content/about.php' file will be used.

This extension provides several implementations for the content storage:

[[yii2tech\content\PhpStorage]] - uses a PHP code files for content storage.
[[yii2tech\content\JsonStorage]] - uses a files in JSON format for content storage.
[[yii2tech\content\DbStorage]] - uses a relational database as a content storage.
[[yii2tech\content\MongoDbStorage]] - uses MongoDB as a content storage.
[[yii2tech\content\ActiveRecordStorage]] - uses ActiveRecord classes for the content storage.

Please refer to the particular storage class for more details.

Note: you can use any combination of implementations for 'source' and 'override' storages, but in order to make sense in 'content override' approach storage based on project files (e.g. PhpStorage or JsonStorage) should be used for the 'source'.

Template rendering

Storing just a final HTML content usually is not enough. For the most cases content management operates by content templates, which will be populated by particular data at runtime. For example: you may want to use application base URL inside the 'About' page content, allowing to refer images and create links. Thus default content will look like following:

<?php
// file '@app/data/pages/about.php'
return [
    'title' => 'About',
    'body' => <<<HTML
<h1>About page content</h1>
<img src="{{appBaseUrl}}/images/about.jpg">
<a href="{{appBaseUrl}}">Home page</a>
...
HTML
];

While displaying the content, you can pass render parameters to [[\yii2tech\content\Item::render()]] in the same way as for regular view rendering:

<?php
// file '@app/views/site/about.php'

use yii\bootstrap\Html;

/* @var $this yii\web\View */
/* @var $contentManager yii2tech\content\Manager */

$contentManager = Yii::$app->get('pageContentManager');
$contentItem = $contentManager->get('about');

$this->title = $contentItem->render('title');
?>
<div class="site-about">
    <?= $contentItem->render('body', [
        'appBaseUrl' => Yii::$app->request->baseUrl
    ]) ?>
</div>

You may setup the content renderer via [[\yii2tech\content\Manager::$renderer]]. This extension provides several implementations for the content renderer:

[[yii2tech\content\PlaceholderRenderer]] - performs content rendering via simple string placeholder replacement.
[[yii2tech\content\PhpEvalRenderer]] - performs content rendering evaluating it as a PHP code.
[[yii2tech\content\MustacheRenderer]] - performs content rendering using Mustache.

Please refer to the particular renderer class for more details.

Note: the actual content template syntax varies depending on actual renderer used.

You may use [[\yii2tech\content\Manager::$defaultRenderData]] to setup default render data to be used for every rendering, so you do not need to pass them all the time:

return [
    'components' => [
        'pageContentManager' => [
            'class' => 'yii2tech\content\Manager',
            'defaultRenderData' => function () {
                return [
                    'appName' => Yii::$app->name,
                    'appBaseUrl' => Yii::$app->request->baseUrl,
                ];
            },
            // ...
        ],
    ],
    // ...
];

Overriding content

You may save content override using [[\yii2tech\content\Manager::save()]]. It will write the data into the 'overrideStorage', keeping the one in 'sourceStorage' intact. For example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');

$contentManager->save('about', [
    'title' => 'Overridden Title',
    'body' => 'Overridden Body',
]);

echo $contentManager->get('about')->render('title'); // outputs 'Overridden Title'

Note: [[\yii2tech\content\Manager]] does NOT perform any check for content parts name matching between source content and overridden one. It is your responsibility to maintain consistence between source and overridden contents set. However, you can use [[\yii2tech\content\Item]] methods (see below) to solve this task.

You can use [[\yii2tech\content\Manager::reset()]] method in order to restore original (default) value for particular content set. For example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');

$contentManager->reset('about');

echo $contentManager->get('about')->render('title'); // outputs 'About'

You can perform same data manipulations using interface provided by [[\yii2tech\content\Item]]. Each content part is accessible via its virtual property with the same name. For example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');

$contentItem = $contentManager->get('about');
$contentItem->title = 'Overridden Title';
$contentItem->body = 'Overridden Body';
$contentItem->save(); // saves override

$contentItem->reset(); // restores origin (source)

Usage of [[\yii2tech\content\Item]] solves the problem of verification of matching source and override contents set.

Saving extra content

You can add a completely new contents set into 'override' storage, even if it has no match in 'source' one. There is no direct restriction for that. For example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');

$contentManager->save('newPage', [
    'title' => 'New page',
    'body' => 'New page body',
]);

echo $contentManager->get('newPage')->render('title'); // outputs 'New page'

$contentManager->reset('newPage');

$contentManager->get('newPage'); // throws `\yii2tech\content\ItemNotFoundException` exception

This can also be performed using [[\yii2tech\content\Item]]. For example:

use yii2tech\content\Item;

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');

$contentItem = new Item([
    'manager' => $contentManager,
]);
$contentItem->id = 'newPage';
$contentItem->setContents([
    'title' => 'New page',
    'body' => 'New page body',
]);
$contentItem->save();

Creating content management web interface

Class [[\yii2tech\content\Item]] is a descendant of [[\yii\base\Model]], which uses its content parts as the model attributes. Thus instance of [[\yii2tech\content\Item]] can be used for creating a web forms, populating from request data and saving. Thus controller, which performs content override may look like following:

use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii2tech\content\ItemNotFoundException;
use Yii;

class PageController extends Controller
{
    /**
     * Updates particular content item, creating/updating an override.
     */
    public function actionUpdate($id)
    {
        $model = $this->findModel($id);

        if ($model->load(Yii::$app->request->post())) {
            if ($model->save()) {
                return $this->redirect(['index']);
            }
        }

        return $this->render('update', [
            'model' => $model,
        ]);
    }

    /**
     * Restores default values for particular content item, removing an override.
     */
    public function actionDefault($id)
    {
        $model = $this->findModel($id);
        $model->reset();
        return $this->redirect(['index']);
    }

    /**
     * @param string $id
     * @return \yii2tech\content\Item
     */
    protected function findModel($id)
    {
        /* @var $contentManager \yii2tech\content\Manager */
        $contentManager = Yii::$app->get('pageContentManager');
        try {
            $model = $contentManager->get($id);
        } catch (ItemNotFoundException $e) {
            throw new NotFoundHttpException('Requested page does not exist.');
        }
        return $model;
    }

    // ...
}

The view file for 'update' action may look like following:

<?php

use yii\widgets\ActiveForm;
use yii\helpers\Html;

/* @var $this yii\web\View */
/* @var $model yii2tech\content\Item */

$this->title = Yii::t('admin', 'Update Page: ') . $model->id;
?>
<div class="row">
    <?php $form = ActiveForm::begin(); ?>

    <?= $form->field($model, 'title')->textInput() ?>

    <?= $form->field($model, 'body')->textarea() ?>

    <div class="form-group">
        <?= Html::submitButton(Yii::t('admin', 'Save'), ['class' => 'btn btn-primary']) ?>
    </div>

    <?php ActiveForm::end(); ?>
</div>

You may setup your own validation rules, attribute labels and hints for the [[\yii2tech\content\Item]] model using [[\yii2tech\content\Manager::$itemConfig]]. For example:

return [
    'components' => [
        'pageContentManager' => [
            'class' => 'yii2tech\content\Manager',
            'itemConfig' => [
                'class' => 'yii2tech\content\Item',
                'rules' => [
                    [['title', 'body'], 'required'],
                    ['title', 'string', 'max' => 255],
                ],
                'labels' => function () {
                    return [
                        'title' => Yii::t('page', 'Title'),
                        'body' => Yii::t('page', 'Body'),
                    ];
                },
                'hints' => function () {
                    return [
                        'title' => Yii::t('page', 'Page title...'),
                        'body' => Yii::t('page', 'Page body content...'),
                    ];
                },
            ],
            // ...
        ],
    ],
    // ...
];

Note: by default, if [[\yii2tech\content\Item::$rules]] are not specified - the 'required' validator will be set for all attributes.

You may also use your own class for the content item, specifying attribute validation rules, labels and hints in ordinary way.

In order to get full list of content items available at particular manager [[\yii2tech\content\Manager::getAll()]] method can be used. So controller action, which lists all available pages, may look like following:

use yii\web\Controller;
use Yii;

class PageController extends Controller
{
    /**
     * Displays list of all available content items.
     */
    public function actionIndex()
    {
        /* @var $contentManager \yii2tech\content\Manager */
        $contentManager = Yii::$app->get('pageContentManager');

        $dataProvider = new ArrayDataProvider([
            'allModels' => $contentManager->getAll(),
            'pagination' => false,
        ]);

        return $this->render('index', [
            'dataProvider' => $dataProvider,
        ]);
    }

    // ...
}

Then the view for the listing may look like following:

<?php

use yii\grid\ActionColumn;
use yii\grid\GridView;

/* @var $this yii\web\View */
/* @var $dataProvider yii\data\ArrayDataProvider */
?>
<?= GridView::widget([
    'dataProvider' => $dataProvider,
    'columns' => [
        'id',
        'title',
        'body',
        [
            'class' => ActionColumn::className(),
            'template' => '{update} {default}',
            'buttons' => [
                'default' => function ($url) {
                    $icon = Html::tag('span', '', ['class' => 'glyphicon glyphicon-repeat']);
                    return Html::a($icon, $url, ['title' => 'Default', 'data-confirm' => 'Are you sure you want to restore defaults for this item?']);
                },
            ],
        ],
    ]
]); ?>

Heads up! While using [[\yii2tech\content\Manager::getAll()]] provides a quick simple way for content listing building, it is not efficient regardless to the computing resources and memory consumption. While using it, the program may reach PHP memory limit in case you have many content items with large data associated.

Working with meta data

Working with content templates, you may want to setup some reference information about them, for example provide description for variables (placeholders) used inside the template. Such information may vary depending on particular content set, like variables for 'about' page may be different from the ones for 'how-it-works' page. Thus it is good practice to save such meta information along with the default content, e.g. in the source file. For example:

<?php
// file '@app/data/pages/about.php'
return [
    'title' => 'About {{appName}}',
    'body' => 'About page content',
    'pageUrl' => ['/site/about'],
    'placeholderHints' => [
        '{{appName}}' => 'Application name'
    ],
];

You can declare meta content parts list using [[\yii2tech\content\Manager::$metaDataContentParts]], for example:

return [
    'components' => [
        'pageContentManager' => [
            'class' => 'yii2tech\content\Manager',
            'metaDataContentParts' => [
                'pageUrl',
                'placeholderHints',
            ],
            // ...
        ],
    ],
    // ...
];

Content parts listed at [[\yii2tech\content\Manager::$metaDataContentParts]] will not be returned by [[\yii2tech\content\Manager::get()]] or [[\yii2tech\content\Manager::getAll()]] methods and thus will not be populated inside [[\yii2tech\content\Item::$contents]]. You should use [[\yii2tech\content\Manager::getMetaData()]] or [[\yii2tech\content\Item::getMetaData()]] to retrieve them. For example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');

$contentItem = $contentManager->get('about');
var_dump($contentItem->has('pageUrl')); // outputs `false`

$metaData = $contentManager->getMetaData('about');
var_dump($metaData['pageUrl']);

$metaData = $contentItem->getMetaData();
var_dump($metaData['pageUrl']);

Meta data usage helps in composition of user-friendly content management interface.

Email template management

Do not limit yourself with 'pages' example. This extension may be used for several purposes, including email template management. Application configuration example:

return [
    'components' => [
        'mailContentManager' => [
            'class' => 'yii2tech\content\Manager',
            'sourceStorage' => [
                'class' => 'yii2tech\content\PhpStorage',
                'filePath' => '@app/data/mail',
            ],
            'overrideStorage' => [
                'class' => 'yii2tech\content\DbStorage',
                'table' => '{{%MailTemplate}}',
                'contentAttributes' => [
                    'subject',
                    'body',
                ],
            ],
        ],
    ],
    // ...
];

Email message composition example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('mailContentManager');
$contentItem = $contentManager->get('contact');

Yii::$app->mailer->compose()
    ->setTo($admin->email)
    ->setFrom([Yii::$app->params['appEmail'] => Yii::$app->name])
    ->setSubject($contentItem->render('subject', ['appName' => Yii::$app->name, 'form' => $this]))
    ->setHtmlBody($contentItem->render('body', ['appName' => Yii::$app->name, 'form' => $this]))
    ->send();

You may simplify this task using [[\yii2tech\content\mail\MailerContentBehavior]] behavior, which, being attached to the mailer component, provides a shortcut method composeFromContent() for quick mail message composition from the content item. Application configuration example:

return [
    'components' => [
        'mailContentManager' => [
            // ...
        ],
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'as content' => [
                'class' => 'yii2tech\content\mail\MailerContentBehavior',
                'contentManager' => 'mailContentManager',
                'messagePopulationMap' => [
                    'subject' => 'setSubject()',
                    'body' => 'setHtmlBody()',
                ],
            ],
        ],
    ],
    // ...
];

Email message composition example:

Yii::$app->mailer->composeFromContent('contact', ['appName' => Yii::$app->name, 'form' => $this])
    ->setTo($admin->email)
    ->setFrom([Yii::$app->params['appEmail'] => Yii::$app->name])
    ->send();

Internationalization

In case you have a multi-lingual project and its content should vary depending on chosen interface language. The best way to handle it will be usage of composite content IDs. Such ID should include actual language as its part. For example: instead of using 'about', you should operate 'en/about', 'ru/about' and so on. File-based storages like [[\yii2tech\content\PhpStorage]] and [[\yii2tech\content\JsonStorage]] are able to operate sub-folders. So the source files structure will look like following:

data/
    pages/
        en/
            about.php
            how-it-works.php
        ru/
            about.php
            how-it-works.php
    mail/
        en/
            contact.php
            reset-password.php
        ru/
            contact.php
            reset-password.php

While retrieving the particular content item, its ID should be composed using [[\yii\base\Application::$language]]. For example:

/* @var $contentManager yii2tech\content\Manager */
$contentManager = Yii::$app->get('pageContentManager');
$contentItem = $contentManager->get(Yii::$app->language . '/about');

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