将视图装饰器应用于 MethodView 派生类答案

【问题标题】：applying view decorators to MethodView derived classes将视图装饰器应用于 MethodView 派生类
【发布时间】：2012-12-24 06:27:22
【问题描述】：

在我的烧瓶应用程序中，所有视图都来自 MethodView。

class TestView(MethodView):
def __init__(self):
    self.form = TestForm()

@login_required
@campaign_required
def get(self,cid):
     .........

并且url规则设置在不同的文件中.....

这篇文章中提到的 django 是否有类似的可能：

What's the difference between the two methods of decorating class-based views?

我需要用一些限制来装饰班级......如上所述......

【问题讨论】：

标签： python flask decorator

【解决方案1】：

我已经写了基于this snippet的小例子：

class BaseApi(MethodView):


def _content_type(self, method):
    """ decorator example """
    def decorator(*args, **kwargs):
        best = request.accept_mimetypes.best_match(['text/html', 'application/json'])

        if best == 'text/html':
            return self._html(*method(*args, **kwargs))

        elif best == 'application/json':
            return self._json(*method(*args, **kwargs))

        else:
            abort(400, err='Unknown accept MIME type - "%s"' % best)
            return

    return decorator

def dispatch_request(self, *args, **kwargs):
    method = super(BaseApi, self).dispatch_request

    if self.method_decorators is None:
        return method(*args, **kwargs)

    method_decorators = self.method_decorators.get(request.method.lower(), [])
    if getattr(method_decorators, '__call__', False):
        method_decorators = [method_decorators]

    common_decorators = self.method_decorators.get('*', [])
    if getattr(common_decorators, '__call__', False):
        common_decorators = [common_decorators]

    method_decorators.extend(common_decorators)

    for decorator in method_decorators:
        method = decorator(self, method)

    return method(*args, **kwargs)

method_decorators = {
    '*': _content_type,   # decorators here are applied to all methods
    # 'get': <another decorator only for get method>,
    # 'post': [<list of decorator functions that are applied for post requests>]
}

【讨论】：