Django：可以在分页中找到特定对象吗？

Question

假设，我想建立一个论坛，实现Thread 和Comment 概念。Comment 模型是ForeignKey 到Thread。

class Thread(models.Model):
    title = models.CharField(max_length=200)
    ....

class Comment(models.Model):
    thread = models.ForeignKey(Thread, ...)
    comment = models.TextField()
    ....

1. 详细讨论帖有一些评论
2. 详情线程的评论使用/?page={number} 进行分页。

目前，我的 cmets 分页运行良好。但是，如果我想找到一个评论对象，我就有问题了。

例如，我在page=3 中找到了带有id=13 的单个评论对象。

这是我的views.py

def thread_detail(request, topic_slug, pk):
    """
    detail thread public view.
    :param `topic_slug` is slug from the topic.
    :param `pk` is id from thread.
    """
    template_name = 'public/thread_detail.html'

    numb_pages = 10
    get_page = request.GET.get('page')
    thread = get_object_or_404(Thread, topic__slug=topic_slug, pk=pk)
    comments = Comment.objects.filter(thread=thread).order_by('created')
    ....

    page_obj = PaginatorFBV(comments, numb_pages, get_page).queryset_paginated()
    page_range = PaginatorFBV(comments, numb_pages, get_page).page_numbering()
    comments = page_obj.object_list

    context = {
        'thread': thread,
        'comments': comments,
        'page_obj': page_obj,
        'page_range': page_range
    }
    return render(request, template_name, context)

我想动态创建它，例如在我的find_comment_view.py：

def find_comment(request, pk):
    """
    Return redirect to the comment on thread, with current page.
    :param `pk` is pk/id from comment.
    """
    comment = get_object_or_404(Comment, pk=pk)
    comments = Comment.objects.filter(thread__in=comment.thread)

    # what i should be do here?

之前非常感谢..

更新：

我试试这个，效果很好。 但是，如果页面很多，我发现另一个问题，例如；几千页..当然需要很长时间...

def find_comment(request, pk):
    """
    Return redirect to the comment on thread, with current page.
    :param `pk` is pk/id from comment.
    """
    comment = get_object_or_404(Comment, pk=pk)
    comments = Comment.objects.filter(thread=comment.thread).order_by('created')
    thread = get_object_or_404(Thread, pk=comment.thread.pk)

    # Initial `page_obj` to get max numb of pagination.
    items_per_page = 10 # this is same with what we do for `numb_pages = 10` inside `def thread_detail(...)`
    initial_page_obj = PaginatorFBV(comments, items_per_page, 1).queryset_paginated()
    max_numb_pages = initial_page_obj.paginator.num_pages

    for page in range(max_numb_pages):
        page += 1
        page_obj = PaginatorFBV(comments, items_per_page, page).queryset_paginated()
        comment_objects = page_obj.object_list

        # Check the output of `comment_objects`
        # >>> print(comment_objects, page)
        # <QuerySet [<Comment: regina>]> 1
        # <QuerySet [<Comment: beverly>]> 2
        # <QuerySet [<Comment: amy>]> 3
        # <QuerySet [<Comment: hannah>]> 4

        for obj in comment_objects:
            if obj.pk == comment.pk:
                # eg: /thread/20/?page=2#comment-30
                return redirect(
                    ('%s?page=%s#comment-%s') % (
                        thread.get_absolute_url(),
                        page, comment.pk
                    )
                )
    return redirect(('%s#comment-%s') % (thread.get_absolute_url(), comment.pk))

在urls.py内部

urlpatterns = [
    ....
    url(
        r'^comment/direct/(?P<pk>[-\d]+)/$',
        find_comment, name='find_comment_page'
    ),
]

Answer 1

可以通过

获取物体的位置

position=Comment.objects.filter(created__lt=comment.created).order_by('created').count()

然后通过获取页​​码

items_per_page=10
page = int(position/items_per_page)