Or
4. Have an unowned link entity (called DocPermissions?) of structure:
[Key] userKey
[Key] documentKey
[Permissions] permissions
where
[Key] is the data type you use as your entity IDs
[Permissions] is a data type to hold the set of permissions (user v.
document) and their statuses.
Each instance of this link entity will allow you to store the
permissions that a given user has with a given document. Query on this
entity to obtain the results that you require (in the form
(ultimately) of a set of keys).
Any help?
On Dec 18, 9:40 am, Chuck Lega <[email protected]> wrote:
> Hi,
> I originally posted this in the appenine-group, but figured that it
> maybe better belongs in this group....
>
> I am working on a project where want to be able to grant different
> permissions for users on entities, say read/write.
> I guess this is a common scenario, and maybe this has been sorted out
> in another thread already but I could not find it.
>
> I am using JDO. This is the setup:
>
> - An entity (e.g. a document) can have many users with different
> permissions associated with it.
> - I want to be able to query for:
> - "what users/permissions does this entity have"
> - "what entities does this user have any permissions on"
> - or even "what entities does this user have write-permissions on"
>
> What would be the proper way of doing this? I have thought of the
> following ways, but have no feel for what is the "correct" way to do
> it to minimize indexes, query roundtrips etc:
>
> 1. The entity having two lists: List<String> permission_w and
> List<String> permission_r ?
> Here the strings represent user ids. Risk of exploding indexes?
>
> 2. The entity having two lists: List<MyUser> permission_w and
> List<MyUser> permission_r ?
> This would make the lists children of the entity (due to JDO) (i
> think?).
>
> 3. The entity having one list: List<UserPermissions> permissions;
> The UserPermission class would contain user_id and read/write flag.
>
> Regards,
> Chuck
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