On Tuesday 27 March 2007 17:18:04 Michael Bayer wrote: > On Mar 27, 2007, at 3:53 AM, [EMAIL PROTECTED] wrote: > > Lets say u have 5 leaf types in 4-5 levels of the hierarchy tree, > > say that makes 10 tables total. > > say E object is a leaf and comes from A.join(B).join(C).join(E) - > > so E is split amongst all A B C E tables. Which is the detail > > table? > > you have to understand....nobody inherits more than one level deep > in almost any inheritance situation. thats just you :) yeaa. seems so.
> he means: > > select * from base_table where id=7 > <fetch row> -> type of object is "A" > > select * from joined_table_A where id = 7 > <fetch row, assemble into A instance> > > -> done i got it this far; but this is applicable only for single lazy relation. if i want all them for which name.starswith(abc), and some are A, some are B, some are XYZ? Then instead of 1 big huge polymoprhic thing, i have to issue n queries (where n is number of leaf types), that is all those selectables that go in the polymunion's dictionary. i'm sure this could be faster in some cases (simple means fast), but then just use non-polymorphic selectables direct and keep the polymorphism "switching" on the python side --- a (pseudo-)polymorphic-mapper that does polymorphism in python only but issues several direct selectables to SQL. Something of sorts? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
