recommend.py 文件源码

def unique_books(user, books, result_count):
    """
    Return unique random books from given list of books.

    :param django.contrib.auth.models.User               user:         The request user.
    :param django.db.models.query.QuerySet[.models.Book] books:        The given list of books.
    :param int                                           result_count: The count of unique books.

    :return set[.models.Book]: The unique books.
    """
    books = Book.exclude_private_books(user, books)
    unique = set()

    if len(books) > START_RECOMMEND:
        while len(unique) < result_count:
            unique.add(books[random.randint(0, len(books) - 1)])

    return unique