sjaakp/yii2-taggable

Manage tags of ActiveRecord in Yii2.

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Type:yii2-extension

2.0.2 2019-12-22 21:22 UTC

This package is auto-updated.

Last update: 2024-12-23 08:04:05 UTC


README

Manage tags of ActiveRecords in PHP-framework Yii 2.0

Latest Stable Version Total Downloads License

This package contains five classes to handle the tagging of ActiveRecords with keywords or similar. The tags can be associated with or decoupled from a model (ActiveRecord), and can be sorted. Tags are manipulated with the excellent jQuery tagEditor developed by Pixabay.

The four main classes of yii2-taggable are:

  • TagBehavior - makes an ActiveRecord behave like a tag;
  • TaggableBehavior - adds the handling of tags to an ActiveRecord;
  • TagEditor - widget to manipulate tags;
  • TagSuggestAction - feeds the autocomplete function of TagEditor with data.

There is also a class TagEditorAsset, which is a helper class for TagEditor.

A demonstration of the yii2-taggable suit is here.

Notice that the API for version 2 is slightly different from that of version 1.

Installation

The preferred way to install yii2-taggable is through Composer. Either add the following to the require section of your composer.json file:

"sjaakp/yii2-taggable": "*"

Or run:

composer require sjaakp/yii2-taggable "*"

You can manually install yii2-taggable by downloading the source in ZIP-format.

Setup

Suppose we have a class (ActiveRecord) Article of articles which can be tagged, and another class Tag to hold the tags.

Tag has at least the following attributes:

  • id: primary key;
  • name: to hold the actual tag keyword;

Junction table

Article and Tag are linked with a junction table in a many-to-many relation. Let's call the table article_tag. It has the following fields:

  • model_id: holds the primary key value of an Article;
  • tag_id: holds the primary key value of a Tag;
  • ord: holds the sorting order of a Tag.

The junction table doesn't need to have a primary key. It's a good idea to set indexes on both model_id and tag_id.

TaggableBehavior

The class Article is taggable, and should be set up like this:

<?php

namespace app\models;

use sjaakp\taggable\TaggableBehavior;

class Article extends ActiveRecord    {

	public function behaviors()
	{
        return [
            'taggable' => [
                'class' => TaggableBehavior::class,
                'junctionTable' => 'article_tag',
                'tagClass' => Tag::class,
            ]
        ];
    }
	// ...
}

TagBehavior

Class Tag behaves as a tag, and looks something like this:

<?php

namespace app\models;

use sjaakp\taggable\TagBehavior;

class Tag extends ActiveRecord    {

	public function behaviors()
	{
        return [
            'tag' => [
                'class' => TagBehavior::class,
                'junctionTable' => 'article_tag',
                'modelClass' => Article::class,
            ]
        ];
    }

	// ...
}

After attaching TagBehavior the class Tag. gains a few new properties and methods. A link to the Tag view can be obtained by:

$link = $tag->link;

models gets all Articles tagged by $tag:

$taggedArticles = $tag->models;

If you'd rather have an ActiveDataProvider to access them, use:

$providerOfTaggedArticles = $tag->getModels();

The count of tagged Articles:

$countTaggedArticles = $tag->modelCount;         

Article view

In the Article view we can now display the tags like so:

<?php
	// ...
/**
 * @var yii\web\View $this
 * @var ap\models\Article $model
 */
?>

<!-- Display article title and body here. -->

<h4>Tags</h4>
<p><?= $model->tagLinks ?></p>

tagLinks is a new virtual attribute, added to Article by TaggableBehavior.

All the Tags can be retrieved with:

$allTags = $article->tagModels;

To get an ActiveQuery, for instance to use in an ActiveDataProvider, use:

$provider = new ActiveDataProvider([
    'query' => $article->getTagModels()
]);

If you want to know whether an Article has a Tag with a certain name, say 'politics', you can query the class like so:

if ($article->hasTag('politics'))   {
    // ...
}

Article update

To make creating and updating Tags easy, we also have to set up TagController:

<?php

namespace app\controllers;

use yii\web\Controller;
use app\models\Tag;
use sjaakp\taggable\TagSuggestAction;

class TagController extends Controller	{

    public function actions()    {
        return [
            'suggest' => [
                'class' => TagSuggestAction::class,
                'tagClass' => Tag::class,
            ],
        ];
    }

	// ...
}

TagEditor

In the Article's update and create views we can now use the TagEditor widget. Add something like this to views\article\_form.php:

<?php

use yii\helpers\Url;
use sjaakp\taggable\TagEditor;

/**
 * @var yii\web\View $this
 * @var app\models\Article $model
 * @var yii\widgets\ActiveForm $form
 */
?>
	...

    <?= $form->field($model, 'tags')->widget(TagEditor::class, [
        'clientOptions' => [
            'autocomplete' => [
                'source' => Url::toRoute(['tag/suggest'])
            ],
        ]
    ]) ?>
	...

tags is also a new virtual attribute of Article, added to it by TaggableBehavior. 'tag/suggest' is the base of the route to the suggest action in TagController, which we defined before. Learn more about the clientOptions from Pixabay.

Modifications

The basic setup of yii2-taggable can be modified in a number of ways. Refer to the source files to see which other options are available. Some are:

  • nameAttribute: name attribute of the tag class. Defined in TagBehavior, TaggableBehavior, and TagSuggestAction. Default: 'name'.
  • tagKeyColumn and modelKeyColumn: foreign key fields in the junction table. Defined in TagBehavior and TaggableBehavior. Defaults: 'tag_id' and 'model_id' respectively.
  • orderColumn: holds order information in the junction table. Defined in TaggableBehavior.
  • renderLink: callable, function($tag, $options), returning the HTML code for a single tag link. Defined by TagBehavior. If not set (default), TagBehaviour renders tag link as a simple HTML a.