Question

嘿大家好我正在使用Appengine / Python而我无法做到修复过去5小时内的BadKeyError错误。我想知道是否有人可以帮我搞清楚。应用程序中导致错误的部分是一个处理用户完成的投票的控制器。 Actor_id是 user和object_id的键是正在存在的对象的键投票。

我一直在通过隐藏和恢复一些代码来测试应用程序，而我确定收到的密钥是好的（第一块），和正在创建实体（第二块）。什么行不通正在创建一个活动实例 - 引发BadKeyError（第三个块）

我添加了控制器代码，型号代码和回溯日志页面中的错误。

# Controller Code

class ActivityHandler(FacebookEnabled):
    def get(self):

        # i.e. fbid / headline id / upvote. This works
        actor_id = self.request.get('actor_id')
        object_id = self.request.get('object_id')

        # creating actor and object from keys (actor_id and object_id). 
        # This works.
        actor = models.Person.get(actor_id)
        object = models.Headline.get(object_id)
        logging.info("Actor " + str(actor) +": " + str(actor.name) +
           " object " + str(object) + ": " + str(object.title))

        # THIS IS WHAT SEEMS TO RAISE AN EXCEPTION
        activity = models.Activity(actor, object, action='upvote')
        activity.put()

# Model Code
class Activity(polymodel.PolyModel):
# User causing the action i.e. a person
    actor = db.ReferenceProperty(Person, required=True,
    collection_name='actors')

    # The object being the subject of the action i.e. headline
    object = db.ReferenceProperty(Headline, required=True,
        collection_name='objects')

    # The action being made
    action = db.StringProperty(required=True, choices=['upvote','downvote'],
         default='upvote')

追溯

Name must be string type, not Headline
Traceback (most recent call last):
 File "/base/python_runtime/python_lib/versions/1/google/appengine/
ext/webapp/__init__.py", line 511, in __call__
   handler.get(*groups)
 File "/base/data/home/apps/libnentest/2.343063076026692316/main.py",
line 125, in get
   activity = models.Activity(actor, object, action='upvote')
 File "/base/python_runtime/python_lib/versions/1/google/appengine/
ext/db/__init__.py", line 726, in __init__
   key_name.__class__.__name__)
BadKeyError: Name must be string type, not Headline

Answer 1

object 始终是一个糟糕的名称选择，很可能导致异常。

Answer 2

PolyModel的构造函数是这样的：class PolyModel(parent=None, key_name=None, **kwds):所以你传递标题对象作为key_name，看起来它必须是来自堆栈跟踪的字符串。

从阅读docs我认为你想要做的是：

activity_kwargs = {
    'actor' : actor,
    'object' : object',
    'action' : 'upvote',
}
activity = models.Activity(**activity_kwargs)
activity.put()

旁注：请勿将object用作变量名称，因为它是内置关键字。

我该如何解决这个错误？ BadKeyError：名称必须是字符串类型

2 个答案: