Python/Tornado - 调用类方法

Python/Tornado - call to classmethod

鉴于这个简单的代码,我在其中声明了一个 class 和一个函数。主要是我尝试调用该函数,但未进行调用。我没有收到任何错误,但如果我打印以了解调用是否发生,则什么也没有发生。

型号

class Balance(Document):
    gross_balance = FloatField(required=True, min_value=0, default=0)

    @classmethod
    def createBalance(cls, gross_balance):
        result = yield Balance.objects.create(gross_balance = gross_balance)
        result.save()
    @classmethod
    def sayHi(cls):
        print "Hi there"

主要

from models import Balance

class CreateBalanceHandler(tornado.web.RequestHandler):

@tornado.gen.coroutine
def post(self):
    gross_balance = self.get_argument('gross_balance')
    Balance.createBalance(gross_balance)
    Balance.sayHi()
    self.redirect('/query/{}'.format(gross_balance))

我做错了什么? sayHi 函数显示其打印,但对 createBalance 没有反应。

在 ioloop 上用 gen.coroutine 装饰 createBalance 到 运行。等到余额被创建调用它像 yield Balance.createBalance() in RequestHandler

型号

class Balance(Document):
    gross_balance = FloatField(required=True, min_value=0, default=0)

    # classmethod must be the most outter decorator (as well as staticmethod)

    @classmethod
    @tornado.gen.coroutine
    def createBalance(cls, gross_balance):
        result = yield Balance.objects.create(gross_balance = gross_balance)
        # AFAIR save returns future and also should be yielded
        # yield. result.save()
        result.save()

    @classmethod
    def sayHi(cls):
        print "Hi there"

主要

from models import Balance

class CreateBalanceHandler(tornado.web.RequestHandler):

    @tornado.gen.coroutine
    def post(self):
        gross_balance = self.get_argument('gross_balance')
        yield Balance.createBalance(gross_balance)
        Balance.sayHi()
        self.redirect('/query/{}'.format(gross_balance))

注意:正如我在代码片段的评论中提到的,在 motorengine 中 Document.save returns Future 并且您可能也想 yield 它,等到它已完成。