django分页页面中不同数量的记录

Question

我正在尝试在第一页 (5) 和所有其他页面（最多 6 个）上使用不同的内容进行分页以最大化元素。 我喜欢这个answer

class MyPaginator(Paginator):

    def __init__(self, **kw):
        self.deltafirst = kw.pop('deltafirst', 0)
        Paginator.__init__(self, **kw)

    def page(self, number):
        number = self.validate_number(number)
        if number == 1:
            bottom = 0
            top = self.per_page - self.deltafirst
        else:
            bottom = (number - 1) * self.per_page - self.deltafirst
            top = bottom + self.per_page
        if top + self.orphans >= self.count:
            top = self.count
        return Page(self.object_list[bottom:top], number, self)


from django.core.paginator import Paginator
from django.core.paginator import EmptyPage
from django.core.paginator import PageNotAnInteger

class NewsView(ListView):
    model = News
    template_name="mysite/news.html"
    paginate_by =  5

    def get_context_data(self, **kwargs):
        context = super(NewsView, self).get_context_data(**kwargs) 
        all_news = News.objects.all().order_by("-date_news")
        paginator = MyPaginator(all_news, self.paginate_by,deltafirst=1)

        page = self.request.GET.get('page')

        try:
            file_exams = paginator.page(page)
        except PageNotAnInteger:
            file_exams = paginator.page(1)
        except EmptyPage:
            file_exams = paginator.page(paginator.num_pages)
        context['all_news'] = file_exams
        return context

但我得到一个错误，我无法弄清楚我做错了什么。错误本身

    paginator = MyPaginator(all_news, self.paginate_by,deltafirst=1)
TypeError: __init__() takes 1 positional argument but 3 were given

Answer 1

首先更改MyPaginator中的__init__方法以修复错误：

from math import ceil


class MyPaginator(Paginator):
    
    def __init__(self, *args, **kw):
        self.deltafirst = kw.pop('deltafirst', 0)
        super().__init__(*args, **kw)
    
    def page(self, number):
        number = self.validate_number(number)
        if number == 1:
            bottom = 0
            top = self.per_page - self.deltafirst
        else:
            bottom = (number - 1) * self.per_page - self.deltafirst
            top = bottom + self.per_page
        if top + self.orphans >= self.count:
            top = self.count
        return Page(self.object_list[bottom:top], number, self)

    @property
    def num_pages(self):
        if self.count == 0 and not self.allow_empty_first_page:
            return 0
        count = max(self.count - self.per_page + self.deltafirst, 0)
        hits = max(0, count - self.orphans)
        return 1 + ceil(hits / self.per_page)

接下来让您的视图更简单，而不是覆盖 get_context_data 覆盖 get_paginator 并将 deltafirst 设置为类属性：

class NewsView(ListView):
    model = News
    template_name="mysite/news.html"
    paginate_by =  5
    paginator_class = MyPaginator
    deltafirst = 1
    
    def get_paginator(self, *args, **kwargs):
        if self.deltafirst:
            kwargs['deltafirst'] = self.deltafirst
        return super().get_paginator(*args, **kwargs)