Method store

/**
 * Overridden Table::store to set created/modified and user id.
 *
 * @param   boolean  $updateNulls  True to update fields even if they are null.
 *
 * @return  boolean  True on success.
 *
 * @since   1.6
 */
public function store($updateNulls = true)
{
    $date = Factory::getDate()->toSql();
    $user = Factory::getUser();
    // Set created date if not set.
    if (!(int) $this->created_time) {
        $this->created_time = $date;
    }
    if ($this->id) {
        // Existing category
        $this->modified_user_id = $user->get('id');
        $this->modified_time = $date;
    } else {
        if (!(int) $this->modified_time) {
            $this->modified_time = $this->created_time;
        }
        // Field created_user_id can be set by the user, so we don't touch it if it's set.
        if (empty($this->created_user_id)) {
            $this->created_user_id = $user->get('id');
        }
        if (empty($this->modified_user_id)) {
            $this->modified_user_id = $this->created_user_id;
        }
    }
    // Verify that the alias is unique
    $table = Table::getInstance('Category', 'JTable', array('dbo' => $this->getDbo()));
    if ($table->load(array('alias' => $this->alias, 'parent_id' => (int) $this->parent_id, 'extension' => $this->extension)) && ($table->id != $this->id || $this->id == 0)) {
        $this->setError(Text::_('JLIB_DATABASE_ERROR_CATEGORY_UNIQUE_ALIAS'));
        return false;
    }
    return parent::store($updateNulls);
}