[Nitro] Join tables

George Moschovitis george.moschovitis at gmail.com
Thu Nov 3 12:31:19 EST 2005

Rob, please....

a diff would REALLy help me...


On 11/3/05, Rob Pitt <rob at motionpath.com> wrote:
> I have pushed a patch that does this to the motionpath darcs repo
> (depends on a couple of others relating to schema evolution also pushed
> by me today).
> Unfortunately it is a little slower on startup as I could not think how
> to get around the problem that some of the tables to be joined could be
> missing when the join table is made without violating the "each og
> entitiy manages it's own store" paradigm there seems to be. This meant
> that sometimes you would have to start the program twice in order to
> have all the foreign key constraints added.
> So, I came up with a solution. I added a
> OgManagedClass.resolve_remote_relations method that returns a list of
> all relations that point *to* OgManagedClass from within other classed
> managed by Og. Then, when making join tables, the constraints try to
> recursively be added to all other already known about classes that point
> at the current class (because now both tables will exist and the join
> table constraints can be made).
> This works fine but is not really ideal. There is a new function called
> create_join_table_foreign_key_constraints(klass,info) that if someone
> came up of a better place to put it, could still be leveraged there instead.
> Enjoy...
> George Moschovitis wrote:
> >please send me the full patch with the foreign table constraints. This
> >was something I planned to add for ages.
> >
> >regards,
> >Geoge.
> >
> >On 11/3/05, Rob Pitt <rob at motionpath.com> wrote:
> >
> >
> >>After updating to the latest nitro dev repository I ran delete_all on a
> >>class that had a join table with itself. Once all records were deleted
> >>there were numbers left over lying around in the join table. I never
> >>noticed this before because I had patched the old version to add
> >>PostgreSQL foreign key constraints on join tables. I will put these
> >>constraints back into our version here which will take care of the
> >>problem for us and possibly look at why that happens later but I thought
> >>everyone else might like a heads up.
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> >>
> >>
> >>
> >
> >
> >--
> >http://www.gmosx.com
> >http://www.navel.gr
> >http://www.nitrohq.com
> >
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