thank you.
in the first post is my real code.
i regard every LTMean entity as a node, and make the nodes to a map by
( k, v ) relations. by every ( k, v ) way, i can go from one node to
another, or go back to the firest.
if use Model, it would be
=====
class LTMean( db.Model): #Model
Info = db.TextProperty()
Way = db.SelfReferenceProperty( collection_name = "Some_Set" )
def NewMean( v ):
newMean = LTMean()
newMean.Way = LTMean( key_name = v )
newMean.put()
=====
but i must set variable attribute name of Way, so i need Expendo.
On 4月18日, 下午8时51分, Robert Kluin <[email protected]> wrote:
> Just a note: 'collection_name' is just a query that is put on the
> 'target' kind when the 'referencing' kind is defined. Your definition
> of the 'referencing' kind doesn't define of those reference properties
> -- so this likely won't work as you're expecting. Perhaps if you
> explain how exactly you're using this we could offer some alternative
> ideas.
>
> You could simply do something like this:
>
> class LTMean( db.Expando ):
> # your definition
> def find_referrers(self, prop):
> return LTMean().all().filter(prop, self)
>
> Then, instead of ltmean_entity.some_collection_name, you'll do
> ltmean_entity.find_referrers('some_thing').
>
> Robert
>
> 2011/4/18 saintthor <[email protected]>:
>
> > how add an attribute of ReferenceProperty to Expando then?
>
> > On 4月18日, 下午2时36分, "Nick Johnson (Google)" <[email protected]>
> > wrote:
> >> Hi,
>
> >> 'collection_name' is a property of the ReferenceProperty class. You can't
> >> have a collection_name if you don't have a reference property.
>
> >> -Nick Johnson
>
> >> On Mon, Apr 18, 2011 at 2:04 AM, saintthor <[email protected]> wrote:
> >> > class LTMean( db.Expando ): #Expando
> >> > Info = db.TextProperty()
>
> >> > def NewMean( k, v ):
> >> > newMean = LTMean()
> >> > setattr( newMean, k, LTMean( key_name = v ).key() )
> >> > newMean.put()
>
> >> > ==============
> >> > how to set the collection_name?
>
> >> > --
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> >> --
> >> Nick Johnson, Developer Programs Engineer, App Engine
>
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