On Sat, 2008-03-08 at 16:19 -0800, brydon wrote:
> I know this answer should exist somewhere in documentation or on the
> net, hopefully someone can point me there. I'm looking for model help
> and I think I can frame it best with an example. Say you're building a
> delicious like model. You have users, user have links. Those links
> have common elements such as url, title, screengrab. They also have a
> context unique to a user, like the date the user added the link.
>
> This leads to at least 3 main db tables. Users, Links, and UserLinks.
> A user adds the link to http://www.djangoproject.com/ which results in
> a link and userlink entry. When the next user adds a link to
> http://www.djangoproject.com/, that only results in an update to
> userlink.
>
> I believe django supports this well by having a ManyToManyField in
> User for Links. It will then create the intermediary join table and
> manage it, which is perfect. The trick is that I want to add more data
> to that intermediary table, for example the date when this particular
> user added this link, etc. From a model perspective, ideally that
> extra information is simply part of the link a user has.
The ManyToManyField is for when you just care about the ends, not the
intermediate linkage. If you also want to work with the intermediate
table, use this approach:
http://www.djangoproject.com/documentation/models/m2m_intermediary/
There's some extra syntax coming in the future to make this type of
setup behave more like ManyToManyfield in terms of the syntax you use
when moving from one end to the other (not touching the intermediate
table), however that won't change the table setup or anything like that
from the above example.
Regards,
Malcolm
--
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