>From a syntactical point of view it would not take much to support multi-table circular references in web2py. That is not why they are not implemented, They are not implemented because they are bad design practice.
If this is a 1-1 relation, there is no need to table A to refer to B and B to A. It is sufficient that A points to B. If this is a many-many this should be done via a link table. I cannot think of any test case when this is a good idea. web2py sets constraints for the purpose of enforcing good practice. Massimo On Nov 11, 10:05 am, DenesL <[email protected]> wrote: > Some of you have missed Mirek's point, and he has a very valid one. > The problem is circular references. > There are ways around it but no elegant solution yet. > > There was discussion some time ago about lazy evaluation of tables. > > I also would like to see this solved in web2py. > > Denes. > > On Nov 11, 10:36 am, Mirek Zvolský <[email protected]> wrote: > > > >> Here's a link to the section in the book: > > >>http://www.web2py.com/book/default/chapter/06#Self-Reference-and-Aliases > > > Yes, I know this, and from that reason I always use 'reference..' > > style syntax. > > > However this is about very special foreign keys, which targets to same > > table (to the primary key in same table). > > > And if there is some cycle in joins in the model (and of course it > > always is, except of very, very simple models), this will not help. > > And there is realy no solution for this in web2py ?? > >
