Django分页:在分页/非分页ListView之间切换

时间:2019-01-09 16:09:51

标签: python django pagination

我正在尝试阐述一种在分页模板和非分页模板之间切换的聪明方法。

我已经有一个可以正常使用的分页器,并且我正在考虑在其旁边添加一个按钮,该按钮显示为“显示所有结果”,该按钮链接到一个未分页的列表,然后会有另一个按钮返回到该分页列表。

1)简单解决方案

使用2个具有属性 paginate_by 的不同分配的ListView(django默认设置为分页),但是由于我的项目中有很多列表,因此使用起来也不方便(也不太聪明)。

2)我被困住的解决方案

编写一个Mixin(稍后将由我的ListViews进行扩展)以根据条件设置变量 paginate_by ,然后向上下文中添加一些有用的变量:

class PaginationMixin:
    no_pagination = False
    no_pagination_url = ''

    def get_paginate_by(self, queryset):
     # overwrite django method
        if self.no_pagination:
            return None
        else:
            return super().get_paginate_by(queryset)

    def get_no_pagination_url(self):
        return self.no_pagination_url

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['no_pagination'] = self.no_pagination
        context['no_pagination_url'] = self.get_no_pagination_url()
        return context

 class MyListView(PaginationMixin, ListView):
     #...
     def get_no_pagination_url(self):
         return reverse('mylist_urlname')

问题:我不知道如何从模板设置 no_pagination 变量。有什么办法可以做到这一点?

感谢您的帮助。

更新的解决方案(由@ hi-lan解决方案编辑): 这样,它将显示所有结果,并保留urlparams(来自过滤器或其他)(如果存在)。

class PaginationMixin:

    toggle_pagination = False
    toggle_pagination_url = ''
    no_pagination = False
    view_name = ''
    urlparams_dict = {}

    def get(self, request, page=None, *args, **kwargs):
        #store current GET params and pop 'page' key
        self.urlparams_dict = request.GET            
        self.urlparams_dict.pop('page', None)

        page = page or request.GET.get('page', '1')
        if page == 'all':
            page = self.paginate_by = None
            self.no_pagination = True
        return super().get(request, page=page, *args, **kwargs)

    def get_paginate_by(self, queryset):
        if self.no_pagination:
            return None
        else:
            return super().get_paginate_by(queryset)

    def get_toggle_pagination_url(self):
        # variables to set in view to toggle this mixin
        if self.toggle_pagination and self.view_name:
            if not self.no_pagination:
                extra = {'page': 'all'}
                self.urlparams_dict.update(extra)
            else:
                self.urlparams_dict.pop('page', None)
            # url keeps track of urlparams adds page=all if toggled
            self.toggle_pagination_url = reverse(self.view_name) + '?' + urlencode(self.urlparams_dict)
        return self.toggle_pagination_url

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['toggle_pagination_url'] = self.get_toggle_pagination_url()
        context['toggle_pagination'] = self.toggle_pagination
        return context

2 个答案:

答案 0 :(得分:1)

问题在于数据从用户流回以指示未分页。我能想到的唯一方法是使用特殊的页码。有两种选择,具体取决于您配置urls.py的方式。

  • path('objects/page<int:page>/', PaginatedView.as_view()),的情况下,特殊编号为0(作为常规页码 从1开始)。

  • 对于/objects/?page=3,特殊编号可以为all

无论哪种情况,我们都需要覆盖get方法,因为它是我们可以检索用户选择的方法。

class PaginationMixin:
    no_pagination = False
    view_name = ''

    def get(self, request, page=None, *args, **kwargs):
        page = page or request.GET.get('page', '1')
        if page in ['0', 'all']:
            page = self.paginate_by = None
        else: pass
        return super().get(request, page=page, *args, **kwargs)

    def get_paginate_by(self, queryset):
        # overwrite django method
        if self.no_pagination:
            return None
        else:
            return super().get_paginate_by(queryset)

    def get_no_pagination_url(self):
        # For using path
        extra = {'page': '0'}
        no_pagination_url = reverse(self.view_name, kwargs=extra)
        # For using query params
        extra = {'page': 'all'}
        no_pagination_url = reverse(self.view_name) + '?' + urlencode(extra)
        return no_pagination_url

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['no_pagination'] = self.no_pagination
        context['no_pagination_url'] = self.get_no_pagination_url()
        return context


class MyListView(PaginationMixin, ListView):
    view_name = 'mylist_urlname'
    #...

答案 1 :(得分:0)

我正在使用此视图尝试gccallie的更新解决方案:

class StageTempList(PaginationMixin, LoginRequiredMixin, SingleTableMixin, FilterView):
    view_name = 'stagetemp-list'
    table_class = StageTempTable
    model = StageTemp
    filterset_class = StageTempFilter
    template_name = 'stage/stagetemp_list.html'
    paginate_by = 30
    strict = False

但是当get_paginate_by返回None时,我得到25行。 Django版本2.1.2

更新:我使用的PaginationMixin类

class PaginationMixin:
    no_pagination = False
    view_name = ''

    def get(self, request, page=None, *args, **kwargs):
        page = page or request.GET.get('page', '1')
        if page in ['0', 'all']:
            page = self.paginate_by = None
            self.no_pagination = True
        else: pass
        return super().get(request, page=page, *args, **kwargs)

    def get_paginate_by(self, queryset):
        # overwrite django method
        if self.no_pagination:
            return None
        else:
            return super().get_paginate_by(queryset)

    def get_no_pagination_url(self):
        extra = {'page': 'all'}
        no_pagination_url = reverse(self.view_name) + '?' + urlencode(extra)
        return no_pagination_url

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['no_pagination'] = self.no_pagination
        context['no_pagination_url'] = self.get_no_pagination_url()
        return context