Django：基于通用视图的“ as_view（）”方法 [英] Django: Generic views based 'as_view()' method

问题描述

我正在开发一个应用程序，其中创建了一个通用的 ListView 。现在，在我的 urls.py 中定义该视图时，我从文档中读取了我需要使用 as_view（）方法如下：

I was working on an application wherein I created a generic ListView. Now, while defining that view in my urls.py, I read from the documentation that I need to use the as_view() method as follows:

from django.conf.urls import patterns, include, url
from .views import BlogIndex

urlpatterns = patterns(
    '',
    url(r'^$', BlogIndex.as_view(), name="index"),
)

现在，我真的不理解文档中关于该方法的内容。有人可以阐明这个概念吗？

Now, I didn't really understood what the documentation had to say about this method. Can someone shed some light into this concept?

推荐答案

在基于类的视图中，您必须调用 as_view（）函数以便返回一个可调用视图，该视图需要一个请求，并返回一个响应。 它是通用视图下请求-响应周期中的主要入口点。

In Class-based views, you have to call as_view() function so as to return a callable view that takes a request and returns a response. Its the main entry-point in request-response cycle in case of generic views.

as_view 是函数（类方法），它将把我的 MyView 类与其URL连接起来。

as_view is the function(class method) which will connect my MyView class with its url.

来自 django文档：

classmethod as_view（** initkwargs）

返回一个可调用的视图，该视图接受一个请求并返回一个响应：

classmethod as_view(**initkwargs)
Returns a callable view that takes a request and returns a response:

您只是不能使用class基于视图的视图，就像在普通基于函数的视图中一样。

You just can't use class-based views like you could in normal function-based views.

BlogIndex(request) # can't do this in case of CBVs

如果您希望CBV正常运行，则以上代码无效。为此，您需要提供一个可调用的视图，然后将请求传递给它。例如：

The above code is not valid if you want the CBVs to function properly. For that, you need to provide a view which is callable and then pass request to it. For example:

response = MyView.as_view()(request)  # valid way

通过在视图类 MyView上调用 as_view（）函数给我一个视图，我将使用 request 参数调用该视图以启动请求-响应周期。

By calling the as_view() function on my view class MyView will give me a view which i will call with request parameter to initiate the request-response cycle.

在您的情况下：

my_callable_view = BlogIndex.as_view() # returns a callable view
<function blog.views.BlogIndex>

现在，调用此函数并传递请求。

Now, call this function and pass the request.

 response = my_callable_view(request) # generate proper response

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