OctoberCMS Model behavior that allows to store some model's attributes in json format in grouping fields in db.

SerializableModel.php

<?php namespace Path\To\Behaviors;

use System\Classes\ModelBehavior;

/**
 * Model behavior that allows to store some model's attributes 
 * in json format in grouping fields in db. 
 *
 * USAGE: In your model add
 *
 * public $implement = ['Path.To.Behaviors.SerializableModel'];
 *
 * And define property "serializable": 
 * 
 * $serializable = [
 *     'my_settings' => [
 *         'rows_count', 
 *         'cols_count',
 *         'some_another_attribute'
 *     ],
 *     'another_json_group_field' => [
 *         'attribute3',
 *         'attribute4'
 *     ]    
 * ]; 
 */
class SerializableModel extends ModelBehavior
{

    protected $requiredProperties = ['serializable'];
    protected $serializableKeys = []; //fieds that store serializable key=>values
    protected $additionalFields = []; //temp help array


    public function __construct($model)
    {
        parent::__construct($model);

        //Take already setted jsonable model's fields
        $jsonable = $this->model->getJsonable();

        // Add serializable fields
        foreach ($this->model->serializable as $json_field => $serializable_fields) {
            array_push($jsonable, $json_field);
            array_push($this->serializableKeys, $json_field);
        }
        // Remeber all jsonable
        //$this->model->jsonable = $jsonable;
        $this->model->jsonable($jsonable);

        $this->model->bindEvent('model.afterFetch', [$this, 'afterModelFetch']);
        $this->model->bindEvent('model.saveInternal', [$this, 'saveModelInternal']);
        $this->model->bindEvent('model.beforeSave', [$this, 'beforeModelSave']);
        $this->model->bindEvent('model.afterSave', [$this, 'afterModelSave']);
    }


    /**
     * Populate the field values from the database record.
     */
    public function afterModelFetch()
    {

        // After model fetch from db add serializable fields to model's attributes
        foreach ($this->serializableKeys as $json_field) {
            // Get additional fields from db (auto converted from json)
            $this->additionalFields[$json_field] = $this->model->$json_field ?: [];
            // Add additional fields to model's regular attributes
            if (is_array($this->additionalFields[$json_field])) {
                $this->model->attributes = array_merge($this->additionalFields[$json_field], $this->model->attributes);
            }
        }

    }

    /**
     * Internal save method for the model
     * @return void
     */
    public function saveModelInternal()
    {

        foreach ($this->serializableKeys as $json_field) {
            $serializableKeys = array_flip($this->model->serializable[$json_field]);
            // Purge the field values from the attributes
            $attributes   = array_diff_key($this->model->attributes, $serializableKeys);
            $this->additionalFields[$json_field]   = array_intersect_key($this->model->attributes, $serializableKeys);
            $this->model->attributes = $attributes;
        }

    }

    /**
     * Before the model is saved, ensure the record code is set
     * and the jsonable field values
     */
    public function beforeModelSave()
    {
        // Before save: store additional field to model's jsonable field
        foreach ($this->serializableKeys as $json_field) {
            if ($this->additionalFields[$json_field]) {
                $this->model->$json_field = $this->additionalFields[$json_field];
            }
        }

    }

    public function afterModelSave()
    {
        $this->afterModelFetch();
    }

}

awesome code ! thanks !
line 3ç need to be changed to $jsonable = $this->model->getJsonable();

it does not seems to work entirely with a pivot model.
the data are well saved but there are not fetched back up, the event afterFetch is never trigered in the pivot model. Any idea why ?