Question

我有点 trouble。参见GAE的聚合物。如果我有两个模型来自一个基数聚合模型,而每个模型都提到另一个“集装箱”模式,集装箱上的收集既包括聚合物,也不只是你所期望的聚合物。这里是显示问题的一个试验案例:

from google.appengine.ext import  db
from google.appengine.ext.db import polymodel

class MyContainer(db.Model):
    name = db.StringProperty(default= mycontainer , multiline=False)

class MyBaseModel(polymodel.PolyModel):    
    name = db.StringProperty(default= mybasemodel , multiline=False)

class MyModelOne(MyBaseModel):
    container = db.ReferenceProperty(MyContainer, collection_name= model_ones )

class MyModelTwo(MyBaseModel):     
    container = db.ReferenceProperty(MyContainer, collection_name= model_twos )

print "Beginning test.
"
c = MyContainer(name="Container")
c.put()
one = MyModelOne(name="One", container=c)
two = MyModelTwo(name="Two", container=c)
one.put()
two.put()

print "Ones:"
for o in c.model_ones:
    print o.name
print "
Twos:"
for o in c.model_twos:
    print o.name

产出:

Beginning test.

Ones:
One
Two

Twos:
One
Two

我在建立我的参考资料库方面找不到一些东西,或者这种预期行为吗?

Answer 1

查阅SDK sources/a>,看来,_ReverseReferenceProperty(将收集资料翻译成Querys)的确试图处理聚合物。 http://code.google.com

海事组织,如果这是众所周知的限制,它就应当在《聚合物》的文件中有所提及。

Edit: The collection-less workaround would be something like this:

for o in MyModel One.all().filter(集装箱 = , c):

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