Google App Engine - 如何扩展db.IntegerProperty [英] Google App Engine - how to extend db.IntegerProperty
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问题描述
当我在整数和字符串之间切换时,我希望扩展db.IntegerProperty。以下是一些代码片段和我在App Launcher日志中获得的错误消息。
任何指针?
Thanks
David
As I swap between integer and string a lot I was hoping to extend db.IntegerProperty. The following are some code snippets and the error message I get in App Launcher's log. Any pointers? Thanks David
class FSIdProperty(db.IntegerProperty):
def getasstring(self):
value = super(FSIdProperty, self)
if value:
return "%01d" % value
else:
return ''
def setasstring(self, value):
if isinstance(value, str):
value = value.replace(',', '')
value = value.replace(' ', '')
newvalue = super(FSIdProperty, self)
newvalue = int(value)
return newvalue
asstring = property(getasstring, setasstring)
...
class dcccategory(db.Model):
categoryid = FSIdProperty(verbose_name="Category Id")
sortorder = FSIdProperty(verbose_name="Sort Order")
description = db.StringProperty(verbose_name="Description")
created_at = UtcDateTimeProperty(verbose_name="Created on", auto_now_add=True)
modifiedon = UtcDateTimeProperty(verbose_name="Modified on", auto_now=True)
modifiedby = db.UserProperty(verbose_name="Modified by", auto_current_user=True)
...
outopt = {
'formtitle': 'Category Maintenance',
'categoryid': pcategory.categoryid.asstring(),
'sortorder': pcategory.sortorder.asstring(),
'description': pcategory.description,
'categorys': pcategorys,
'formerror': ''}
...
File "C:\_PythonApps\costcontrol\fcccategorymaint.py", line 17, in displayone
'categoryid': pcategory.categoryid.asstring(),
AttributeError: 'int' object has no attribute 'asstring'
https://developers.google.com/appengine/articles/extending_models
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