On Jul 28, 11:37 pm, Michael Bayer <mike...@zzzcomputing.com> wrote: > On Jul 27, 2010, at 9:59 PM, Kalium wrote: > > > I'm trying to determine whether or not there are any value in one > > mapped object relation that correspond to another mapped object > > relation > > > i.e > > A.x - represents a relation of x's on A > > B.x - represents a relation of x's on B > > > They both use their own separate mapping tables for these relations. > > So I want to find out of any of A.x is also present in B.x > > how about > > query(x).filter(x.a_id==my_a.id).filter(x.b_id==my_b.id) > > ? > > thats assuming you're starting with a particular A and B. > >
Opps, accidentaly replied to Michael and not the group. I wasn't dealing with a particular A and B. I wasn't successful in using the tables in the outer query so I merely reconstructed the where clause in the exists query that I used to join the outer tables in the first place, i.e A.x.any(B.x.any()).where(X.id == my_id) Thanks > > > The closes I've had to it working was in the follwing fashion, by > > doing the following; > > > exists([1],from_obj=join(A_x_mapping_table,B_x_mapping_table, > > > onclause=A_x_mapping_table.c.id==B_x_mapping_table.c.id)) > > > I put this exists clause into an existing filter() but it didn't > > correlate the tables with those in the outer query (which I really > > need it to do!), so I tried using correlate function to correlate the > > table on the join() but it didn't seem to do anything (I've used it in > > other situations with success but not this time). > > > Also , A.x.any(B.x.any()) > > seems to almost do what I want as well, but again, doesn't correlate > > to outer query and because I'm using 0.4 it does not have a > > correlate() method in ORM! > > > Any other hints as to how I can do this ? > > > Thanks > > > -- > > You received this message because you are subscribed to the Google Groups > > "sqlalchemy" group. > > To post to this group, send email to sqlalch...@googlegroups.com. > > To unsubscribe from this group, send email to > > sqlalchemy+unsubscr...@googlegroups.com. > > For more options, visit this group > > athttp://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
