在 Google App Engine 中更改实体的属性

Question

我们的设施票请求系统已经上线，但现在我们想编辑与请求实体类型 (requesttype) 关联的属性。当我换行时：

requesttype = db.StringProperty(verbose_name="Request Type*",choices=(["Bulky Item Disposal","Carpentry","Ceiling,Doors","Electrical","Elevator","Fire Equipment","Groundskeeping","Hazardous Waste","HVAC","Kitchen Equipment","Lighting,Painting","Plumbing","Recycling","Refrigeration","Too Cold","Too Hot","Trash","Vehicle Maintenance","Water Leak","Windows","Other"]))

到

requesttype = db.StringProperty(verbose_name="Request Type*",choices=(["Bulky Item Disposal","Carpentry","Ceiling","Doors","Electrical","Elevator","Fire Equipment","Groundskeeping","Hazardous Waste","HVAC","Kitchen Equipment","Lighting","Locksmith","Painting","Plumbing","Recycling","Refrigeration","Too Cold","Too Hot","Trash","Vehicle Maintenance","Water Leak","Windows","Other"]))

我在日志中收到以下错误；

Property requesttype is u'Ceiling,Doors'; must be one of ['Bulky Item Disposal', 'Carpentry', 'Ceiling', 'Doors', 'Electrical', 'Elevator', 'Fire Equipment', 'Groundskeeping', 'Hazardous Waste', 'HVAC', 'Kitchen Equipment', 'Lighting', 'Locksmith', 'Painting', 'Plumbing', 'Recycling', 'Refrigeration', 'Too Cold', 'Too Hot', 'Trash', 'Vehicle Maintenance', 'Water Leak', 'Windows', 'Other']
    Traceback (most recent call last):
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1511, in __call__
        rv = self.handle_exception(request, response, e)
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1505, in __call__
        rv = self.router.dispatch(request, response)
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
        return route.handler_adapter(request, response)
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1077, in __call__
        return handler.dispatch()
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 547, in dispatch
        return self.handle_exception(e, self.app.debug)
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
        return method(*args, **kwargs)
      File "/base/data/home/apps/s~mma-facreq/6.372062129927600214/main.py", line 158, in get
        self.response.out.write(template.render(template_values))
      File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/jinja2-2.6/jinja2/environment.py", line 894, in render
        return self.environment.handle_exception(exc_info, True)
      File "/base/data/home/apps/s~mma-facreq/6.372062129927600214/html/manage.html", line 1, in top-level template code
        {% extends "html/base.html" %}
      File "/base/data/home/apps/s~mma-facreq/6.372062129927600214/html/base.html", line 41, in top-level template code
        {% block content %}{% endblock %}
      File "/base/data/home/apps/s~mma-facreq/6.372062129927600214/html/manage.html", line 14, in block "content"
        {% for x in reqs %}
      File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2326, in next
        return self.__model_class.from_entity(self.__iterator.next())
      File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 1438, in from_entity
        return cls(None, _from_entity=entity, **entity_values)
      File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 970, in __init__
        prop.__set__(self, value)
      File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 614, in __set__
        value = self.validate(value)
      File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2841, in validate
        value = super(StringProperty, self).validate(value)
      File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 646, in validate
        (self.name, value, self.choices))
    BadValueError: Property requesttype is u'Ceiling,Doors'; must be one of ['Bulky Item Disposal', 'Carpentry', 'Ceiling', 'Doors', 'Electrical', 'Elevator', 'Fire Equipment', 'Groundskeeping', 'Hazardous Waste', 'HVAC', 'Kitchen Equipment', 'Lighting', 'Locksmith', 'Painting', 'Plumbing', 'Recycling', 'Refrigeration', 'Too Cold', 'Too Hot', 'Trash', 'Vehicle Maintenance', 'Water Leak', 'Windows', 'Other']

Answer 1

您的原始代码中似乎有错字，用它来保存一些数据存储条目，然后更新您的代码以修复它。

您现在必须在数据存储中有一些条目包含“Ceiling,Doors”作为请求类型。当它们被获取时，它们会导致错误，因为这不再是合法的请求类型。

要解决此问题，您基本上需要将“Ceiling,Doors”、“Ceiling”、“Doors”添加到选项中，然后将数据存储中具有“Ceiling,Doors”的所有实体更新为适当的，价值。完成此操作后，您可以选择删除“天花板、门”。