为普通的get_context_data扩展通用视图类 [英] Extending generic view classes for common get_context_data

问题描述

  def get_context_data（ self，** kwargs）：
＃首先调用基本实现来获取上下文
 context = super（MyListView，self）.get_context_data（** kwargs）
＃在房子里添加
上下文['house'] = self.get_object（）。house 
返回上下文
  

因为我不喜欢重复自己，我以为我可以创建一个扩展视图的类，然后我可以将所有的视图都放在新的扩展视图类上。事情是，我使用了4类视图：CreateView，UpdateView，ListView和DeleteView。我真的要为其中一个创建一个新的课程吗？

没有像djangobase视图类的东西？也许是更聪明的方式来做到这一点？非常感谢提前！

解决方案

创建Mixin：

  from django.views.generic.base import ContextMixin 
 
 class HouseMixin（ContextMixin）：
 def get_house（self）：
＃获取房子
返回房子
 
 def get_context_data（self，** kwargs）：
 ctx = super（HouseMixin，self）.get_context_data（** kwargs）
 ctx [ 'house'] = self.get_house（）
 return ctx 
  

然后在你的其他类你会使用多个继承：

  class HouseEditView（HouseMixin，UpdateView）：
 pass 
 
 class HouseListView（HouseMixin，ListView）：
 pass 
  

等等，然后所有这些意见将在上下文中具有 house 。

I constantly see myself having to add the same extra variable to the context of many of my views.

def get_context_data(self, **kwargs):
    # Call the base implementation first to get a context
    context = super(MyListView, self).get_context_data(**kwargs)
    # Add in the house
    context['house'] = self.get_object().house
    return context

As I don't like repeating myself, I thought I could create a new class extending the view and then I could base all my views on the new extended view class. The thing is, there are 4 classes of views I use: CreateView, UpdateView, ListView and DeleteView. Do I really have to create a new class for each of one of them?

Isn't there something like a django "base" view class? Maybe a smarter way to do this? Many thanks in advance!

解决方案

Create a Mixin:

from django.views.generic.base import ContextMixin

class HouseMixin(ContextMixin):
  def get_house(self):
    # Get the house somehow
    return house

  def get_context_data(self, **kwargs):
    ctx = super(HouseMixin, self).get_context_data(**kwargs)
    ctx['house'] = self.get_house()
    return ctx

Then in your other classes you'd use multiple inheritance:

class HouseEditView(HouseMixin, UpdateView):
  pass

class HouseListView(HouseMixin, ListView):
  pass

and so on, then all these views will have house in the context.

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