On Wed, Feb 11, 2009 at 9:06 PM, khsing <khsing...@gmail.com> wrote:
>
> Alex, thank you very much.
>
> I find if g1 belong g2, g2 will belong g1 automatically, but that is not
> right.
>
> should I rewrite models like this one?
>
> groups = models.ManyToManyField('self', symmetrical=False)
>
>
> On Wed, Feb 11, 2009 at 10:40 PM, Alex Gaynor <alex.gay...@gmail.com>
> wrote:
> >
> >
> > On Wed, Feb 11, 2009 at 2:29 AM, khsing <khsing...@gmail.com> wrote:
> >>
> >> class user(models.Model):
> >> username = models.CharField(max_length=50)
> >>
> >> class group(models.Model):
> >> groupname = models.CharField(max_length=50)
> >> users = models.ManyToManyField(user)
> >> groups = models.ManyToManyField('self')
> >>
> >> there are my models.
> >>
> >> I have no idea to get a complete group list in such models, anyone
> >> give me a suggestion.
> >>
> >> example:
> >> user U1 belong group G1 and group G1 belong G2, I want get G1 and G2 via
> >> U1.
> >> like this
> >>
> >> def get_all_groups(user):
> >> return all_groups
> >>
> >> >>>get_all-groups(U1)
> >> [G1, G2]
> >>
> >> that all.
> >>
> >> Thank.
> >>
> >>
> >>
> >>
> >> On Tue, Feb 10, 2009 at 12:18 PM, khsing <khsing...@gmail.com> wrote:
> >> > Alex, thanks, now it work.
> >> >
> >> > now have a new problem is may a group can contain itself, this will be
> a
> >> > loop.
> >> >
> >> > how to avoid this condition?
> >> >
> >> >
> >> >
> >> > On Tue, Feb 10, 2009 at 11:28 AM, Alex Gaynor <alex.gay...@gmail.com>
> >> > wrote:
> >> >>
> >> >>
> >> >> On Mon, Feb 9, 2009 at 10:18 PM, khsing <khsing...@gmail.com> wrote:
> >> >>>
> >> >>> I want design a group that can contain other groups, and one group
> can
> >> >>> belong many groups.
> >> >>>
> >> >>> I write such code below, but not right.
> >> >>>
> >> >>> class Group(models.Model):
> >> >>> groups = models.ManyToManyField(Group)
> >> >>>
> >> >>> any suggestion?
> >> >>>
> >> >>> or how to design such a group.
> >> >>>
> >> >>> thanks.
> >> >>>
> >> >>> --
> >> >>> A man live in jail and want to break.
> >> >>> http://blog.khsing.net
> >> >>>
> >> >>>
> >> >>
> >> >> To have a relationship with oneself you do
> >> >>
> >> >> ManyToManyField("self")
> >> >>
> >> >> --
> >> >> "I disapprove of what you say, but I will defend to the death your
> >> >> right to
> >> >> say it." --Voltaire
> >> >> "The people's good is the highest law."--Cicero
> >> >>
> >> >> >>
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > A man live in jail and want to break.
> >> > http://blog.khsing.net
> >> >
> >>
> >>
> >>
> >> --
> >> A man live in jail and want to break.
> >> http://blog.khsing.net
> >>
> >>
> >
> > you could probably do something like:
> > def all_groups(user):
> > groups = set()
> > for group in user.groups.all():
> > groups.add(group)
> > for other_group in group.groups.all():
> > groups.add(other_group)
> > return groups
> >
> > --
> > "I disapprove of what you say, but I will defend to the death your right
> to
> > say it." --Voltaire
> > "The people's good is the highest law."--Cicero
> >
> > >
> >
>
>
>
> --
> A man live in jail and want to break.
> http://blog.khsing.net
>
> >
>
Yes the symmetrical argument for many to many fields on self basically reads
"if I am friends with you, are you friends with me". In this case it's an
ownership thing, so the answer is no, if I own you, you don't own me.
Alex
--
"I disapprove of what you say, but I will defend to the death your right to
say it." --Voltaire
"The people's good is the highest law."--Cicero
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