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Group A has members 1, 2, 3
Cached members 1 is a member of A via ""
2 is a member of A via ""
3 is a member of A via ""
Group B has members A, 4, 5
Cached members: 4 is a member of B via "" $1
5 is a member of B via "" $2
A is a member of B via "" $3
1 is a member of B via "$3" $4
2 is a member of B via "$3" $5
3 is a member of B via "$3" $6
Group C has members A, B, 6
6 is a member of C via "" $7
A is a member of C via "" $8
1 is a member of C via $8 $9
2 is a member of C via $8 $10
3 is a member of C via $8 $11
B is a member of C via "" $12
4 is a member of C via $12 $13
5 is a member of C via $12 $14
A is a member of C via $12 $15
1 is a member of C via $15 $16
2 is a member of C via $15 $17
3 is a member of C via $15 $18
Group D has members A, C
A is a member of D via "" $19
1 is a member of D via $19 $20
2 is a member of D via $19 $21
3 is a member of D via $19 $22
C is a member of D via "" $23
6 is a member of D via $23 $24
A is a member of D via $23 $25
1 is a member of D via $25 $26
2 is a member of D via $25 $27
3 is a member of D via $25 $28
B is a member of D via $23 $29
4 is a member of D via $29 $30
5 is a member of D via $29 $31
A is a member of D via $29 $32
1 is a member of D via $32 $33
2 is a member of D via $32 $34
3 is a member of D via $32 $35
Adding a new user, 7, to group A.
Add the user to group A in the groups table.
Find all entries for group A in the cache table.
For each entry in that list:
Add "7 is a member of $entry->top via $entry->id"
Deleting a user, 7, from group A:
Remove the user from group A in the groups table.
find all entries in the cache table where the principal id is user 7 and
the parent id is A. (requires a self join)
nuke them
Alternatively:
find all entries for A in the cache table.
For each one, find the child whose id is 7.
Nuke it
Adding a group, B to group D.
Add group B as a member of D in the groups table.
In the cache table:
$id = Add group B as a member of D via ""
For each member of group B (4, 5, A):
$sid= 4 is a member of D via $id
$sid= 5 is a member of D via $id
$sid= A is a member of D via $id
if the member is a group itself, recurse down:
1 is a member of D via $sid
2 is a member of D via $sid
3 is a member of D via $sid
Find all places where D is a member of $foo.
Repeat the above procedure, substituting $foo for D
and making $id D's id.
Removing B as a member of D:
Remove B as a member of D in the groups table.
Find all references to D in the pseudogroups table.
Find all children of D which are B:
Recurse down with the following algorithm:
If it's a user, delete it.
If it's a group, recurse through each member,
deleting its children and then deleting the
group itself.
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