On Sat, Sep 5, 2009 at 9:40 PM, Matthew <[email protected]> wrote:
>
> Does Web2py have any concept of Polymorphic Associations like Ruby or
> Generic Relations like Django?
>
I think this is simple - rather than declaring a Field as a db.table (ergo a
reference), or a forward "reference" to another table, you can simply define
the field as was done before the forward reference syntax - as an integer
field.
We could make a generic reference to affect this - perhaps it would be
easier for people to remember, e.g.:
db.table_define( 'mytable',
# ....
Field( 'myref', 'reference generic' ); # DAL doesn't have this;
should it so that generic references are explicitly named?
If this seems too simple, remember the DAL makes a default ID, and it is
numeric and autoincrementing (there are no classes to deal with).
No you can simple do something like
for for in db(db.othertable.id == db.mytable.myref).select():
print row.value_of_interest
So - there are your "Polymorphic Associations" or "Generic Relations" ---
without the fancy names or complications - the ID is just an index - an
integer, and uniformly so.
- Yarko
>
> This would be very beneficial for tagging or voting, because there is
> usually a need to tag or vote on different models in the same
> application.
>
> Thanks,
> Matthew
> >
>
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