向NDB中的模型添加StructuredProperty [英] Adding a StructuredProperty to a Model in NDB
问题描述
(无法想象一个更好的标题:S)
因此,我最近从db更改为ndb,并且我无法让一部分工作。我有这个包含章节的教程模型,因此我使用'ndb.StructuredProperty'将模型章节与本教程相关联。
我可以创建教程和章节,但没有问题,但我无法将章节指向教程。
教程模型:
class Tutorial(ndb.Model):
title = ndb.StringProperty(required = True)
presentation = ndb。 TextProperty(required = True)
extra1 = ndb.TextProperty()
extra2 = ndb.TextProperty()
extra3 = ndb.TextProperty()
tags = ndb.StringProperty(重复= True)
votes = ndb.IntegerProperty()
created = ndb.DateTimeProperty(auto_now_add = True)
last_modified = ndb.DateTimeProperty(auto_now = True)
章节= ndb。 StructuredProperty(Chapter,repeated = True)
编辑类:
class EditTut(FuHandler):
def get(self):
...
...
def post(self):
editMode = self.request.get('edit')
如果editMode =='2':
...
...
elif editMode =='1':
tutID = self.request.cookies.get('tut_id','')
tutorial = ndb.Key('Tutorial',tutID)
title = self.request.get(chapTitle)
content = self.request.get(content)
note = self.request.get(note)
chap = Chapter(title = title,content = content,note = note)
chap.put()
tutorialInstance = tutorial.get()
tutorialInstance.chapters = chap
tutorialInstance.put()
self.redirect('/ editTut?edit =%s'%'0')
else:
self.redirect('/ editTut?edit =%s'%1')
使用这段代码创建教程,但是我得到这个错误:
tutorialInstance.chapters = chap
AttributeError:'NoneType'对象没有属性'章节'
更新:借助@nizz,
change
tutorialInstance = tutorial.get()
tutorialInstance.chapters = chap
到:
tutorialInstance = ndb.Key('Tutorial',int(tutID))。get()
tutorialInstance.chapters.append(chap)
完美运作。
(couldn't think of a better title :S )
So I've recently changed from db to ndb and i can't get one part to work. I have this tutorial model that has chapters, so I am using 'ndb.StructuredProperty' to associate the model Chapter to the tutorial. I can create the tutorials and the chapter with no problems but i can't point the chapters to the tutorial.
The Tutorial Model:
class Tutorial(ndb.Model): title = ndb.StringProperty(required=True) presentation = ndb.TextProperty(required=True) extra1 = ndb.TextProperty() extra2 = ndb.TextProperty() extra3 = ndb.TextProperty() tags = ndb.StringProperty(repeated=True) votes = ndb.IntegerProperty() created = ndb.DateTimeProperty(auto_now_add=True) last_modified = ndb.DateTimeProperty(auto_now=True) chapters = ndb.StructuredProperty(Chapter, repeated=True)
The Edit Class:
class EditTut(FuHandler): def get(self): ... ... def post(self): editMode = self.request.get('edit') if editMode == '2': ... ... elif editMode == '1': tutID = self.request.cookies.get('tut_id', '') tutorial = ndb.Key('Tutorial', tutID) title = self.request.get("chapTitle") content = self.request.get("content") note = self.request.get("note") chap = Chapter(title=title, content=content, note=note) chap.put() tutorialInstance = tutorial.get() tutorialInstance.chapters = chap tutorialInstance.put() self.redirect('/editTut?edit=%s' % '0') else: self.redirect('/editTut?edit=%s' % '1')
Using this code the tutorial is created but i get this error:
tutorialInstance.chapters = chap AttributeError: 'NoneType' object has no attribute 'chapters'
解决方案Update: with the help of @nizz, changing
tutorialInstance = tutorial.get() tutorialInstance.chapters = chap
to:
tutorialInstance = ndb.Key('Tutorial', int(tutID)).get() tutorialInstance.chapters.append(chap)
worked perfectly.
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