limited to non_primary mapper ? creating relationships with non_primary mapper is a bad idea. the "foreignkey" error really means, "cant find a foreignkey *that I recognize as part of the parent or child tables*".
On Jan 23, 2007, at 12:43 PM, svilen wrote: > > while on polymorphic-union mappers vs non-polymorphic.. > > i have 3 kinds of type-queries: query_ALL-instances, > quiery_BASE-instances, quiery_SUB-instances. > > First gives me all instances of a class or subclasess thereof, and is > matching the main polymorphic-union mapper. The 3rd is a .select( > table.c.typecolumn != base-type), piped through that too. > > For the 2nd one - getting the direct instances only (no subclasses) - > i have a choice: > a) have another non-primary mapper with some select( > table.c.typecolumn==class_discriminator) as a table > b) pipe this same select through the the main mapper > > So far i'm going the first way, but i'm not sure which one is better. > Can u give any suggestion? If there are no big penalties for b), i > will prefer that one; building another mapper was a tricky thing - > and it does not work right now, for rev 2233. e.g. > > For a very simple case, B inh A, A points to self: > > ArgumentError: Cant determine relation direction for 'linkA' on > mapper 'Mapper|A|bz4A|non-primary' with primary join '"bz4A". > "linkA_id" = "A".db_id' - foreign key columns are present in both the > parent and the child's mapped tables. Specify 'foreign > key' argument. > > Although the foreignkey _is_ there. i rmember this same error hapened > before on some other occasion and then it disappeared. > > Anyway, if b) will work, i'll abandon it and not debug it to find why > it breaks - unless you want it found and fixed. > > ciao > svil > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
