src/Models/EloquentModel.php
public function setAttribute($key, $value)
    {
        if (in_array($key, $this->multipleHighloadBlockFields)) {
            $this->attributes[$key] = serialize($value);

            return $this;
        }

        parent::setAttribute($key, $value);

        return $this;
    }
public function setAttribute($key, $value)
    {
        if (in_array($key, $this->multipleHighloadBlockFields)) {
            $this->attributes[$key] = serialize($value);

            return $this;
        }

        parent::setAttribute($key, $value);

        return $this;
    }
Set a given attribute on the model.

@param  string  $key
@param  mixed  $value
@return $this