google应用引擎中的选择属性 [英] choice property in google app engine

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本文介绍了google应用引擎中的选择属性的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

平台:django 1.0,Google应用引擎,app-engine-patch,python 2.5.4

platform: django 1.0, google app engine, app-engine-patch , python 2.5.4

我正在使用选择属性,因为我一直都是在django网站中使用

i am tring to use the choices attribute as i always have been using in django website

STATUS_CHOICES = ( (1, _('Yet To Start')), (2, _('Running')), (3, _('Paused')), (4, _('Completed')), (5, _('Cancelled')), (6, _('Error')),)

class Campaign(db.Model):
    name = db.TextProperty()
    status = db.IntegerProperty(choices=STATUS_CHOICES,default=2)

现在,我已经移动到应用引擎,我看不到这是工作...

now as i have moved to app-engine i dont see this is working...

我得到一个


BadValueError

BadValueError

属性状态为3;必须是
之一((1,u'Yet To Start'),(2,
u'Running'),(3,u'Paused'),(4,
u '完成'),(5,u'Cancelled'),(6,
u'Error'))

Property status is 3; must be one of ((1, u'Yet To Start'), (2, u'Running'), (3, u'Paused'), (4, u'Completed'), (5, u'Cancelled'), (6, u'Error'))

如何解决这个问题呢?

推荐答案

这是一个无法解决的文档问题。简单地说,在使用GAE时,您不能这样做。

This is a documented problem that will not be resolved. Simply put, you can't do this when using GAE.

Guido在关闭上述票时说以下内容:

Guido says the following when closing the above ticket:

我很抱歉,但我必须将其关闭为无效。

I'm very sorry, but I have to close this as invalid.

App Engine定义的db.Property类是
,与Django定义不同。请参阅
http://code.google.com/appengine /docs/datastore/propertyclass.html#Property

The App Engine definition of the choices parameter to the db.Property class is different from the Django definition. See http://code.google.com/appengine/docs/datastore/propertyclass.html#Property

我意识到,当您尝试从$ b $创建表单时,可能会导致问题b模型,但解决方案是使用自定义窗口小部件覆盖表单域,
将所需选项列表传递给窗口小部件。 (在
Rietveld中有一个例子,在codereview / views.py,类SettingForm。)

I realize that this may cause problems when you're trying to create a form from the model, but the solution is to override the form field using a custom widget and passing the list of desired choices to the widget. (There's an example of this in Rietveld, in codereview/views.py, class SettingForm.)

这篇关于google应用引擎中的选择属性的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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