动态设置带有装饰器的方法

Question

我有这个class:

class SomeMixin:
    permissions = (SomePermission,)
    methods = ('GET',)

    @list_route(methods=methods, url_path='en', permission_classes=permissions)
    def en_list(self):
        return get_translated_objects(self, 'en')

    @list_route(methods=methods, url_path='ru', permission_classes=permissions)
    def ru_list(self):
        return get_translated_objects(self, 'ru')

    @detail_route(methods=methods, url_path='en', permission_classes=permissions)
    def en_detail(self):
        return get_translated_object(self.get_object(), 'en')

    @detail_route(methods=methods, url_path='ru', permission_classes=permissions)
    def ru_detail(self):
        return get_translated_object(self.get_object(), 'ru')

我以后可以有更多的语言，这不是一个好的解决方案。
我想创建语言列表循环并使用 setattr(self, func_name, func) 向 class 添加方法，例如：

langs = ('en', 'ru')
for lang in langs:
    setattr(self, func.__name__, func)

但是我应该给每个方法添加装饰器，我该怎么做呢？

Answer 1

我相信您应该能够将此示例的内容修补到您的代码中。也就是说，从 http header 和 return 适当的响应中检测语言似乎是一种更好的方法。这种方法虽然功能性但不是最干净的。

# This decorator is meant to simulate the decorator exposed by django
def route(url, language, method):
    def wrapper(func):
        def inner(*args, **kwargs):
            print('url => {0}'.format(url))
            print('language => {0}'.format(language))
            print('method => {0}'.format(method))
            func(*args, **kwargs)
        return inner
    return wrapper


# This class is analogous to your SomeMixin class
class foo(object):
    def __init__(self):
        method = 'GET'
        # fields holds the parameters that will change for each method like url
        # and language
        fields = (('en', '/en', 'en_list'), ('ru', '/ru', 'ru_list'))
        for lang, url, func_name in fields:
            setattr(self, func_name, route(url=url, language=lang, method=method)(self.func_creator(lang)))


    def func_creator(self, language):
        def inner():
            print('hello in {0}'.format(language))
        return inner


def main():
    foo_instance = foo()
    print('Calling foo.en_list()')
    foo_instance.en_list()

    print()

    print('Calling foo.ru_list()')
    foo_instance.ru_list()


if __name__ == '__main__':
    main()

动态设置带有装饰器的方法

Set methods with decorators dynamically

python

django-rest-framework

python-decorators