从ndb.KeyProperty() - Google Cloud Datastore NDB添加,更新,删除 [英] Add, Update, Delete from a ndb.KeyProperty() - Google Cloud Datastore NDB
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问题描述
以下是我的多对多关系模型:
class ModelA(ndb。模型):
pre>
name = ndb.StringProperty(required = true)
model_b = ndb.KeyProperty(kind = ModelB,重复= True)
class ModelB ndb.Model):
name = ndb.StringProperty(required = true)
model_a = ndb.KeyProperty(kind = ModelA,重复= True)
我的问题是,如何添加/更新/删除单个(或多个)KeyProperty,比如 model_b ?
解决方案我设法做到这样:
<$ c $ b $ modelA.model_b.pop(pos)#从列表中删除
ModelA。从列表中删除
ModelA.model_b.pop(pos)#从列表中删除
ModelA。 put()#更新
Here are my many-to-many relationship models:
class ModelA(ndb.Model): name = ndb.StringProperty(required=true) model_b = ndb.KeyProperty(kind=ModelB,repeated=True) class ModelB(ndb.Model): name = ndb.StringProperty(required=true) model_a = ndb.KeyProperty(kind=ModelA,repeated=True)
My question is, how do I add/update/delete a single (or many) KeyProperty from let's say model_b?
解决方案I managed to do it like this:
pos = ModelA.model_b.index(ndb.Key('ModelB',213)) # Get position from list ModelA.model_b.pop(pos) # Remove from list ModelA.put() # Update
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