yii2-taggable-behavior

What is Taggable Behavior?

This extension behavior component implements tagging functions to your models.

Installation

The preferred way to install this extension is through composer.

Either run

composer require 2amigos/yii2-taggable-behavior:~1.0

or add the following to the require section of your application's composer.json file:

"2amigos/yii2-taggable-behavior": "~1.0"

Usage example

Configuration

First you need to configure model as follows:

use dosamigos\taggable\Taggable;

class Post extends ActiveRecord
{
    public function behaviors() {
        return [
            [
                'class' => Taggable::className(),
            ],
        ];
    }
}

Database Tables

First you need to create a tag (you can choose the name you wish) table with the following format, and build the correspondent ActiveRecord class (i.e. Tag):

+-----------+
|  tag  |
+-----------+
| id        |
| frequency |
| name      |
+-----------+

After, if you wish to link tags to a certain ActiveRecord (lets say Tour), you need to create the table that will link the Tour Model to the Tag:

+-------------------+
| tour_tag_assn |
+-------------------+
| tour_id           |
| tag_id            |
+-------------------+

Models

Next, we need to configure the relationship with Tour:

/**
 * @return \yii\db\ActiveQuery
 */
public function getTags()
{
    return $this->hasMany(Tag::className(), ['id' => 'tag_id'])->viaTable('tour_tag_assn', ['tour_id' => 'id']);
}

Its important to note that if you use a different name, the behavior's $relation attribute should be changed accordingly.

Finally, setup the behavior, and the attribute + rule that is going to work with it in our Tour class, on this case we are going to use defaults tagNames:

/**
 * @inheritdoc
 */
public function rules()
{
    return [
        // ...
        [['tagNames'], 'safe'],
        // ...
    ];
}

/**
 * @inheritdoc
 */
public function behaviors()
{
    return [
        // for different configurations, please see the code
        // we have created tables and relationship in order to
        // use defaults settings
        Taggable::className(),
    ];
}

Example

Thats it, we are now ready to use tags with our model. For example, this is how to use it in our forms together with our Selectize Widget:

// On TagController (example)
// actionList to return matched tags
public function actionList($query)
{
    $models = Tag::findAllByName($query);
    $items = [];

    foreach ($models as $model) {
        $items[] = ['name' => $model->name];
    }
    // We know we can use ContentNegotiator filter
    // this way is easier to show you here :)
    Yii::$app->response->format = Response::FORMAT_JSON;

    return $items;
}


// On our form
<?= $form->field($model, 'tagNames')->widget(SelectizeTextInput::className(), [
    // calls an action that returns a JSON object with matched
    // tags
    'loadUrl' => ['tag/list'],
    'options' => ['class' => 'form-control'],
    'clientOptions' => [
        'plugins' => ['remove_button'],
        'valueField' => 'name',
        'labelField' => 'name',
        'searchField' => ['name'],
        'create' => true,
    ],
])->hint('Use commas to separate tags') ?>

As you can see, tagNames is the attribute (by default) from which we can access our tags and they are stored in it as names separated by commas if you defined your attribute tagNames as string or null, if you define tagNames as an array, it will be filled with the related tags.

Once you post a form with the above field, the tags will be automatically saved and linked to our Tour model.

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