Question

我如何通过＆＃34;请求＆＃34;到ListView使用＆＃34; paginate_by＆＃34;作为变量？

我找到了很多像这样的例子：

class CarListView(ListView):
    model = models.Car      
    template_name = 'app/car_list.html'  
    context_object_name = "car_list"    
    paginate_by = 10

我想从我的用户设置模型中获取paginate_by变量＆＃34; UserSettings＆＃34;

我已经厌倦了以下方式使用它：

class CarListView(ListView):
    model = models.Car      
    template_name = 'app/car_list.html'  
    context_object_name = "car_list"
    user_settings = UserSettings.objects.get(user=request.user.id)   
    paginate_by = user_settings.per_page

但我有错误＆＃34;姓名＆＃39;请求＆＃39;未定义＆＃34;

Answer 1

您可以添加方法get_paginate_by()来执行您需要的操作并使用来自self.request的请求。

示例代码为

class CarListView(ListView):
  ...
  def get_paginate_by(queryset):
        user_settings = UserSettings.objects.get(user=self.request.user.id) 
        return user_settings.per_page

妥善处理错误情况。

Answer 2

为了安全回退：

class CarListView(ListView):
    model = models.Car      
    template_name = 'app/car_list.html'  
    context_object_name = "car_list"    
    paginate_by = 10
    user_settings = UserSettings


    def get_paginate_by(self, queryset):
        """
        Try to fetch pagination by user settings,
        If there is none fallback to the original.
        """

        try:
            self.paginate_by = self.user_settings.objects.get(user=self.request.user.id).per_page
        except:
            pass
        return self.paginate_by

或者如果您想在不同的视图中使用它，请创建一个Mixin：

class UserPagination(object):

    def get_paginate_by(self, queryset):
        """
        Try to fetch pagination by user settings,
        If there is none fallback to the original.
        """
        try:
            self.paginate_by = self.user_settings.objects.get(user=self.request.user.id).per_page
        except:
            pass
        return self.paginate_by

然后：

class CarListView(UserPagination, ListView):
    model = models.Car      
    template_name = 'app/car_list.html'  
    context_object_name = "car_list"    
    paginate_by = 10
    user_settings = UserSettings

基于Django类的视图将paginate_by视为变量

2 个答案: