GAE 如何打印存储在 ndb.LocalStructuredProperty 中的项目 [英] GAE How to print items stored in ndb.LocalStructuredProperty

问题描述

使用文档中的示例但使用 LocalStructuredProperty:

Using the example from the Docs but using LocalStructuredProperty:

class Address(ndb.Model):
    type = ndb.StringProperty() # E.g., 'home', 'work'
    street = ndb.StringProperty()
    city = ndb.StringProperty()

class Contact(ndb.Model):
    name = ndb.StringProperty()
    addresses = ndb.LocalStructuredProperty(Address, repeated=True)

guido = Contact(name='Guido',
            addresses=[Address(type='home',
                               city='Amsterdam'),
                       Address(type='work',
                               street='Spear St',
                               city='SF')])

这实际上是我用我的模型尝试它的方式:

This is actually how I am trying it with my model:

guido = Contact(name='Guido')
a = Address()
a.type='home'
a.city='Amsterdam' # etc etc..
guido.addresses.append(a)
guido.put()

现在说明天我想打印出地址中的项目，我从网页的 url 中传递了一个 contact_id，我在处理程序中尝试以下操作:

Now say tomorrow I want to print out the items in addresses, I have an contact_id passed in a url from a web page and I try the following in a handler:

    contact_id = self.request.get('contact_id')
    contact = Contact.get_by_id(int(contact_id))
    logging.info("=====start contact addresses report===========================================")
    for item in contact.addresses:
         logging.info(item.type)
         logging.info(item.city)
    logging.info("=====finish contact addresses report===========================================")

我已经查看了大多数 SO ndb 问题，但看不到任何可以回答此问题的内容.我在文档中读到数据存储在不透明的 blob 中，并且我尝试了各种尝试访问这些项目的方法.我最终希望能够添加、编辑和减去项目，只是为了记录我正在使用此属性，因为它希望在计费时更便宜" - 但在我的应用程序启动并运行之前我无法测试它.我知道我在这里遗漏了一些基本的东西，感谢任何帮助.

I have looked at most of the SO ndb questions but cannot see anything that answers this. I read in docs that data is stored in opaque blob, and i have tried various ways of trying to access the items. I ultimately want to be able to add, edit and subtract items, Just for the record I am using this property as it hopefully will be "cheaper" in billing - but i can't test it until I have my app up and running. I know I am missing something basic here, Any help appreciated.

推荐答案

看来问题是我有 guido.put 而不是 guido.put()当您检查时，一切看起来都不错 - 那么它在内存中.但是当你尝试检索时稍后，您只会得到 contact.addresses[[]].一个浪费我时间的小错误.

It appears the problem was that I had guido.put instead of guido.put() Everything looks ok when you inspect - its in memory then. But when you try and retrieve at a later point, you will only get contact.addresses[[]]. A small mistake that has wasted my time.

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