func (p *Parser) GetProducer(id int, page int) ([]model.AnimeItem, int, error) {
    q := map[string]interface{}{"page": page}
    doc, code, err := p.getDoc(utils.BuildURLWithQuery(q, malURL, "anime", "producer", id, "a"), "#content .js-categories-seasonal")
    if err != nil {
        return nil, code, err