类视图原理

最新推荐文章于 2019-12-25 15:17:50 发布

原创最新推荐文章于 2019-12-25 15:17:50 发布 · 304 阅读

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#类视图原理

本文详细解析了在web框架中，视图函数如何接收请求参数，初始化类实例，并通过dispatch方法选择合适的请求处理方法，如GET、POST等，实现请求响应流程。

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  @classonlymethod
    def as_view(cls, **initkwargs):
        """
        Main entry point for a request-response process.
        """
        ...省略代码...

        def view(request, *args, **kwargs):
            self = cls(**initkwargs)
            if hasattr(self, 'get') and not hasattr(self, 'head'):
                self.head = self.get
            self.request = request
            self.args = args
            self.kwargs = kwargs
            # 调用dispatch方法，按照不同请求方式调用不同请求方法
            return self.dispatch(request, *args, **kwargs)

        ...省略代码...

        # 返回真正的函数视图
        return view


    def dispatch(self, request, *args, **kwargs):
        # Try to dispatch to the right method; if a method doesn't exist,
        # defer to the error handler. Also defer to the error handler if the
        # request method isn't on the approved list.
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
        else:
            handler = self.http_method_not_allowed
        return handler(request, *args, **kwargs)