Perhaps you could store the connection graph in some other way? What you do will depend on how the relationships work and how you need to access the data, perhaps keeping a simple 'relative' list would work? Or perhaps you could use a 'standard' property to store the relation and add another property to store the type / directions of the relationship. Really hard (for me at least) to give concrete ideas without an understanding of what the data is or how it will be created and accessed.
Robert 2011/4/18 saintthor <[email protected]>: > 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? >> >> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> > Groups >> >> > "Google App Engine" group. >> >> > To post to this group, send email to [email protected]. >> >> > To unsubscribe from this group, send email to >> >> > [email protected]. >> >> > For more options, visit this group at >> >> >http://groups.google.com/group/google-appengine?hl=en. >> >> >> -- >> >> Nick Johnson, Developer Programs Engineer, App Engine >> >> > -- >> > You received this message because you are subscribed to the Google Groups >> > "Google App Engine" group. >> > To post to this group, send email to [email protected]. >> > To unsubscribe from this group, send email to >> > [email protected]. >> > For more options, visit this group >> > athttp://groups.google.com/group/google-appengine?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
