decorators.py 文件源码

def __call__(self, func):
        if hasattr(func, '__params__'):
            func.__params__.append(self)
            return func

        @wraps(func)
        def _decorator(*args, **kwargs):
            if len(args) < 1:
                # Call function immediately, maybe raise an error is better.
                return func(*args, **kwargs)

            extra_kwargs = None
            if isinstance(args[0], View):
                request = args[0].request
                # Update the kwargs from Django REST framework's APIView class
                if isinstance(args[0], APIView):
                    extra_kwargs = args[0].kwargs

            else:
                # Find the first request object
                for arg in args:
                    if isinstance(arg, (RestRequest, HttpRequest)):
                        request = arg
                        break
                else:
                    request = args[0]

            if request:
                # Checkout all the params first.
                for _param in _decorator.__params__:
                    _param._parse(request, kwargs, extra_kwargs)
                # Validate after all the params has checked out, because some validators needs all the params.
                for _param in _decorator.__params__:
                    for validator in _param.validators:
                        validator(_param.related_name, kwargs, _param.verbose_name)

            return func(*args, **kwargs)

        _decorator.__params__ = [self]
        return _decorator