Yes, that was I wanted. This case like I know you, but you don't know me.
I notice when symmetrical argument added, a group object has
related_name_set object, so I can write code like this.
def all_group(user):
groups = []
for group in user.group_set.all():
if not group in groups: groups.append(group)
for other_group in group.group_set.all():
if not other_group in groups: groups.append(other_group)
return groups
that right?
Thanks.
On Thu, Feb 12, 2009 at 10:08 AM, Alex Gaynor <alex.gay...@gmail.com> wrote:
>
>
> 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
>
> >
>
--
A man live in jail and want to break.
http://blog.khsing.net
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