Re: CUG

On Sat, 3 Feb 2001, Nabil Sayegh wrote:

> It's clear that everybody has the permissions that guests have.
> Members of family shall also(automatically) have the permissions
> that friends have ...

I thought you wanted something more complex. From what I understand you
could implement "levels". When you put a picture you indicate what level
the person needs.

A picture with level 0 can be seen by anybody. A picture with level 1 can
be seen by anyone with leve 1 and above.. Get it?

> I want the same group management like under unix.

Not really. :-)

> How shall I know that family may see 'guest-pictures' ?

The "level" scheme accomplishes this.

> Without groups in groups its easy to SELECT the pictures somebody has
> access to, but with ?

> What if later I want to give all colleagues the rights that my
> friends have (stupid example, I know ...)

Another way which is more flexible, although a bit more complex, is to
allow someone to belong to different groups and to have each picture
allowable to more than one group.

Something like

--picture table
pictureID Description
1 graduation
2 dance party
3 at the library
4 getting out of shower
5 nude

--group table
groupID Description
1 Guest
2 friends
3 girlfriend

--user table
personID groupID
1 guest
2 friend
3 girlfriend

-user_group
userID groupID
1 1
2 1
2 2
3 3

--Picture table
pictureID groupID
1 1
2 1
3 1
4 2
5 3

That should work for what you described with no problems (except if you
have more than one user on the girlfriend category, then you could
eventually have serious problems with this setup) <G>

The query for a setup like this would be a 3 way join between user, group
and the picture table. Something like

select picture.PictureID, from picture, user_group where
userVAR = user_group.userID and user_group.groupID = picture.groupID

I didn't test the query and didn't looked at it for too long, but it would
be something simmilar if not that.

Based on you request I think the "levels" is by far the easiest way to
accomplish what I understood you asked for.

Hope this helped.