mixin 扩展类的装饰

1，步骤：

　　1，自定义装饰器　　

# 我们自定义的装饰器:
def my_decorator_1(func):
    def wrapper(request, *args, **kwargs):
        print('自定义装饰器被调用了')
        print('请求路径%s' % request.path)
        return func(request, *args, **kwargs)
    return wrapper

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　　2，定义Mixin扩展类（该类一定要继承object类，一定要重写as_view()函数）

# 定义的 Mixin 扩展类:
class FirstMixin(object):
    @classmethod
    def as_view(cls, *args, **kwargs):
        view = super().as_view(*args, **kwargs)
        view = my_decorator_1(view)
        return view

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　　3，定义类视图，继承自：扩展类 + View　(该类视图就是要装饰的视图，View一定要放在最后)

　　（可以参考类继承顺序的调用，理解super().as_view的调用）

# 定义的类视图, 继承自: 扩展类 + View
class DemoView(FirstMixin, View):
    def get(self, request):
        print('demoview get')
        return HttpResponse('demoview get')

    def post(self, request):
        print('demoview post')
        return HttpResponse('demoview post')

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多个Mixin扩展类的连用

# 我们自定义的装饰器:
def my_decorator_1(func):
    def wrapper(request, *args, **kwargs):
        print('自定义装饰器被调用了')
        print('请求路径%s' % request.path)
        return func(request, *args, **kwargs)
    return wrapper

# 我们自定义的装饰器:
def my_decorator_2(func):
    def wrapper(request, *args, **kwargs):
        print('自定义装饰器被调用了')
        print('请求路径%s' % request.path)
        return func(request, *args, **kwargs)
    return wrapper

class FirstMixin(object):
    """ FirstMixin 扩展类 """
    @classmethod
    def as_view(cls, *args, **kwargs):
        view = super().as_view(*args, **kwargs)
        view = my_decorator_1(view)
        return view

class SecondMixin(object):
    """ SecondMixin 扩展类 """
     @classmethod
    def as_view(cls, *args, **kwargs):
        view = super().as_view(*args, **kwargs)
        view = my_decorator_2(view)
        return view

class DemoView(FirstMixin, SecondMixin, View):
    def get(self, request):
        print('demoview get')
        return HttpResponse('demoview get')

    def post(self, request):
        print('demoview post')
        return HttpResponse('demoview post')

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