README

Enum type behavior and helper for Yii2, for PostgreSQL only.

Using enum types provides good readability of data in DataBase without spending extra resources on the storage of duplicate values (in cases with any string types).

Such types are more difficult to maintain in a project. This extension helps to simplify the use of enum types.

Limitation

Since 1.1.0 requires PHP >= 5.5

For method renameValue() requires PostgreSQL >= 10.0

Installation

The preferred way to install this extension is through composer.

Either run

php composer.phar require --prefer-dist tigrov/yii2-pgsql-enum

or add

"tigrov/yii2-pgsql-enum": "~1.0"

to the require section of your composer.json file.

Usage

Once the extension is installed, you can create new enum types as follow:

class NewEnum extends \tigrov\pgsql\enum\EnumBehavior
{
    /** @var array list of attributes that are to be automatically humanized value */
    public $attributes = ['type' => 'type_key'];
}

Create a table with the enum type

// Create the enum in DB or in PHP code 
NewEnum::create(['value1', 'value2', 'value3']);

\Yii::$app->getDb()->createCommand()
    ->createTable('model', [
       'id' => 'pk',
       'type_key' => NewEnum::typeName(), // 'new_enum'
   ])->execute();

Create a model for the table

class Model extends \yii\db\ActiveRecord
{
    /**
     * @inheritdoc
     */
    public function behaviors()
    {
        return [
            NewEnum::class,
            // 'type' => [
            //    'class' => NewEnum::class,
            //    'attributes' => ['type' => 'type_key'],
            //],
        ];
    }
    
    /**
     * @inheritdoc
     */
    public function save($runValidation = true, $attributeNames = null)
    {
        // You can add new values if they are not exists in the enum type
        try {
            return parent::save($runValidation, $attributeNames);
        } catch (\yii\db\Exception $e) {
            NewEnum::add($this->type_key);
            return parent::save($runValidation, $attributeNames);
        }
    }
}

and then use them in your code

/**
 * @var ActiveRecord $model
 */
$model = new Model;
$model->type_key = 'value1';
$model->save();

$newModel = Model::findOne($model->id);
$newModel->type_key === 'value1';
$newModel->type === 'Value1'; // see yii\helpers\Inflector::humanize($word, true)

// The extension will try to add a new value if it does not exist
$model->type_key = 'non-existent value';
$model->save();

// To get all enum values in [value => humanized value] array notation
NewEnum::values();

// To get all enum values without humanized values in [value1, value2, ...] array notation
NewEnum::codes();

// To add a new value to the enum type
NewEnum::add('new value');

// To get a humanized value
NewEnum::value('new value'); // returns "New Value" or translated value

// To check if the enum type has a value
NewEnum::has('new value');

// To rename a value of the enum type
NewEnum::renameValue('new value', 'renamed value');

// To remove a value from the enum type
NewEnum::remove('renamed value');

// To check if the enum type exists
NewEnum::exists();

// To drop the enum type
NewEnum::drop();

Examples

Gender codes:

class GenderCode extends \tigrov\pgsql\enum\EnumBehavior
{
    /**
     * @var array list of attributes that are to be automatically humanized value.
     * humanized => original attribute
     */
    public $attributes = ['gender' => 'gender_code'];

    /**
     * Values of genders
     * @param bool $withEmpty with empty value at first
     * @return array
     */
    public static function values($withEmpty = false)
    {
        return ($withEmpty ? ['' => static::emptyValue()] : []) + [
            'M' => \Yii::t('enum', 'Male'),
            'F' => \Yii::t('enum', 'Female'),
        ];
    }
}

class Model extends \yii\db\ActiveRecord
{
    public function behaviors()
    {
        return [
            GenderCode::class,
        ];
    }
}

$model->gender_code = 'M';
$model->gender === 'Male'; // or translated value

Messenger names:

class MessengerType extends \tigrov\pgsql\enum\EnumBehavior
{
    /** @var array list of attributes that are to be automatically humanized value */
    public $attributes = ['type' => 'type_key'];
    
    /**
     * Values of Messengers
     * @param bool $withEmpty with empty value at first
     * @return array
     */
    public static function values($withEmpty = false)
    {
        return ($withEmpty ? ['' => static::emptyValue()] : []) + [
            'skype' => 'Skype',
            'whatsapp' => 'WhatsApp',
            'viber' => 'Viber',
            'facebook' => 'Facebook',
            'imessage' => 'iMessage',
            'telegram' => 'Telegram',
            'line' => 'Line',
            'jabber' => 'Jabber',
            'qq' => 'QQ',
            'blackberry' => 'BlackBerry',
            'aim' => 'AIM',
            'ebuddy' => 'eBuddy',
            'yahoo' => 'Yahoo',
            'other' => \Yii::t('enum', 'Other'),
        ];
    }
}

$model->type_key = 'whatsapp';
$model->type === 'WhatsApp';

Translate values:

class TranslatableType extends \tigrov\pgsql\enum\EnumBehavior
{
    public static $messageCategory = 'app';
}

// $model->type is translated value
// TranslatableType::values() are all translated values

Type values as constants:

class Status extends \tigrov\pgsql\enum\EnumBehavior
{
    const ACTIVE = 'active';
    const PENDING = 'pending';
    const REJECTED = 'rejected';
    const DELETED = 'deleted';

    public $attributes = ['status' => 'status_key'];
    public static $messageCategory = 'status';
}

// Do not forget to initialize the enum type in the database
// E.g. Status::create();

$model->status_key = Status::PENDING;
$model->status === 'Pending'; // or translated value

License

MIT