hi If you store the depth of the path as an integer property of each child, you can then restrict you query by the depth below a parent as well.
Cheers T On Monday, June 25, 2012 12:35:11 PM UTC+8, gor wrote: > > the parent_path property could work. thanks. > > On Monday, June 25, 2012 11:49:12 AM UTC+8, timh wrote: >> >> Hi >> >> Here is one approach you could use. >> >> In each entity store a list of paths of each parent. ie in second >> scenario >> >> H has a list property called parent_paths it would have the following >> values ['/a/g','/a'] and its children would have ['/a','/a/g','/a/g/h'] etc >> >> Then given any entity you can fetch all levels of descendants. So in your >> example you just need to query for any entity >> that has '/a/g/h' in its parent_paths. This doesn't allow you to >> restrict depth though. >> >> Cheers >> >> Tim >> >> On Monday, June 25, 2012 11:17:50 AM UTC+8, gor wrote: >>> >>> *Scenario 1:* >>> If I have a Great Grandpa ancestor (let's name him A); And my key is >>> from "child1"; is there a way to check that my great grandpa is A? (hope I >>> can do that without needing to loop) >>> >>> Or can I check, if child1's key is of the path "A->B->C". >>> *A -> B -> C -> (child1, child2...)* >>> >>> *Scenario 2:* >>> From the above. Great Grandpa has another descendants from "G", and >>> would like to retrieve "H"s children: >>> >>> *A-> B -> C -> (children of C)* >>> *...-> G -> H -> (children of H)* >>> >>> I like to retrieve "H"s children, thinking that Grandpa knows the path >>> from A, G, to H... can I do that? (hope I can do this in a query, without >>> looping) >>> >>> If you have a Go1 example: that would be awesome... >>> >>> Thanks Google! and I love you! >>> >>> >>> -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/mp0GXxN-Bb8J. 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.
