skeeks\cms\models\CmsContentElement2cmsUser::rules PHP Method

    public function rules()
    {
        return [[['created_by', 'updated_by', 'created_at', 'updated_at', 'cms_user_id', 'cms_content_element_id'], 'integer'], [['cms_user_id', 'cms_content_element_id'], 'required'], [['cms_user_id', 'cms_content_element_id'], 'unique', 'targetAttribute' => ['cms_user_id', 'cms_content_element_id'], 'message' => 'The combination of Cms User ID and Cms Content Element ID has already been taken.']];
    }