Using Q Objects

q_objects.py

def perform_search(request):
    list = request.POST.getlist('genres')
    genre_query = Q()
    author_query = Q()
    title_query = Q()
    description_query = Q()

    liked_books = []

    for gen in list:
        genre_query = genre_query | Q(genre__iexact=gen)
    
    title_search_terms = request.POST['title-search-input']
    author_search_terms = request.POST['author-search-input']
    description_search_terms = request.POST['description-search-input']

    if title_search_terms:
        terms = title_search_terms.split()
        for term in terms:
            title_query = title_query | Q(title__icontains=term)
        print(title_query)

    if author_search_terms:
        terms = author_search_terms.split()
        for term in terms:
            author_query = author_query | Q(author__icontains=term)

    if description_search_terms:
        terms = description_search_terms.split()
        for term in terms:
            description_query = description_query | Q(description__icontains=term)
    
    books = Book.objects.filter(author_query, title_query, genre_query, description_query)
    for book in books:
        if book.likes.filter(id=request.user.id).exists():
            liked_books.append(book.id)

    template = loader.get_template('index.html')
    context = {
        'books': books,
        'liked_books': liked_books,
        'heading_label': 'Search Result',
        'genres': Book.GENRES
    }

    if request.user.is_authenticated:
        return HttpResponse(template.render(context, request))
    else:
        return redirect('accounts/login')

Thank you for sharing!