> >> seems this is the month of the many2many relations ;-) > > > > more on the theme: many2many > > > > i have a association of 3 tables, A,B,C. > > one of them (C) may not be present in all assoc_items. > > So that column has nullable=True. > > when you say, "association of 3 tables, A,B, C", do you mean, there > is a table "D" that contains a reference to all of A, B, C ? > > if thats the case, and D's reference columns to A, B, and C > comprise a primary key, SA's default behavior when it sees a > composite primary key of "3, 4, NULL" is to determine that the row > does not represent an entity. use the flag "allow_null_pks=True" > on your mapper() to have such a primary key be counted. yes, thanks, that's it.
btw whats the reasoning/rational behind the above default behaviour? --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
