Model behaviors are used to implement common functionality.
Unlike Traits these can be implemented either directly in a class or by extending the class. You can read more about behaviors here.

Purgeable

Purged attributes will not be saved to the database when a model is created or updated. To purge attributes in your model, implement the October.Rain.Database.Behaviors.Purgeable behavior and declare a $purgeable property with an array containing the attributes to purge.

class User extends Model
{
    public $implement = [
        'October.Rain.Database.Behaviors.Purgeable'
    ];

    /**
     * @var array List of attributes to purge.
     */
    public $purgeable = [];
}

You can also dynamically implement this behavior in a class.

/**
 * Extend the RainLab.User user model to implement the purgeable behavior.
 */
RainLab\User\Models\User::extend(function($model) {

    // Implement the purgeable behavior dynamically
    $model->implement[] = 'October.Rain.Database.Behaviors.Purgeable';

    // Declare the purgeable property dynamically for the purgeable behavior to use
    $model->addDynamicProperty('purgeable', []);
});

The defined attributes will be purged when the model is saved, before the model events are triggered, including validation. Use the getOriginalPurgeValue to find a value that was purged.

return $user->getOriginalPurgeValue($propertyName);

Sortable

Sorted models will store a number value in sort_order which maintains the sort order of each individual model in a collection. To store a sort order for your models, implement the October\Rain\Database\Behaviors\Sortable behavior and ensure that your schema has a column defined for it to use (example: $table->integer('sort_order')->default(0);).

class User extends Model
{
    public $implement = [
        'October.Rain.Database.Behaviors.Sortable'
    ];
}

You can also dynamically implement this behavior in a class.

/**
 * Extend the RainLab.User user model to implement the sortable behavior.
 */
RainLab\User\Models\User::extend(function($model) {

    // Implement the sortable behavior dynamically
    $model->implement[] = 'October.Rain.Database.Behaviors.Sortable';
});

You may modify the key name used to identify the sort order by defining the SORT_ORDER constant:

const SORT_ORDER = 'my_sort_order_column';

Use the setSortableOrder method to set the orders on a single record or multiple records.

// Sets the order of the user to 1...
$user->setSortableOrder($user->id, 1);

// Sets the order of records 1, 2, 3 to 3, 2, 1 respectively...
$user->setSortableOrder([1, 2, 3], [3, 2, 1]);

Note: If implementing this behavior in a model where data (rows) already existed previously, the data set may need to be initialized before this behavior will work correctly. To do so, either manually update each row's sort_order column or run a query against the data to copy the record's id column to the sort_order column (ex. UPDATE myvendor_myplugin_mymodelrecords SET sort_order = id).

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